Dive sites in Thailand

Situated along the northern coast of Koh Adang inside Tarutao National Marine Park, this site features a sheltered fringing reef that transitions from shallow coral gardens into a sandy seabed. Granite boulders scattered along the reef structure create microhabitats for benthic critters and juvenile fish. Calm conditions make it a regular choice for easy morning dives and training sessions out of nearby Koh Lipe.

Set along the southern coast of Koh Adang facing the strait toward Koh Lipe, this site features a sloping fringing reef composed of large Porites coral bommies, staghorn thickets, and sandy channels. The shallow reef flat transitions into a steady incline where macro critters and schooling reef fish congregate around scattered boulders. Tidal flow running through the channel between the islands can bring intermittent drift conditions, though the site generally offers a calm profile suited to relaxed exploration and training.

Adang Corner sits off the rocky coast of Koh Adang in the Tarutao National Marine Park. Huge granite boulders slope downward toward a sandy seabed, creating natural corridors and swim-throughs coated in colorful soft corals, crinoids, and sea fans. Water movement here can shift quickly around the headland, pulling in cruising pelagics while macro photographers inspect the reef crevices.

Alhambra Rock is an isolated offshore submerged pinnacle in the eastern Gulf of Thailand, rising from a sandy seabed up toward the surface. Because it sits far off the Rayong coastline without sheltering landmasses, it functions as a primary gathering point for pelagic predators and dense schools of baitfish. The granite boulder structure features steep drop-offs covered in sea whips, soft corals, and massive barrel sponges.

Alhambra Rock is an offshore submerged pinnacle rising from a sandy seabed south of the Koh Samet archipelago in Rayong. Because the granite formation sits isolated in open water, it acts as a magnet for schooling pelagic species and reef fish. Large granite boulders form swim-throughs, overhangs, and crevices blanketed in sea anemones, branching sea fans, and encrusting sponges.

AlotMeant is an artificial reef and coral nursery site located off the west coast of Koh Tao. Built using engineered metal structures, concrete blocks, and recycled materials, the project was created to cultivate coral fragments and relieve diver pressure on natural fringing reefs. The site features various experimental nursery domes where transplanted branching and table corals provide habitat for reef fish in sheltered, shallow water.

Rising from the sandy seabed between Phuket and the Phi Phi Islands, this completely submerged limestone pinnacle does not break the surface, earning its local Thai name Hin Jom (Sunken Rock). The pinnacle is smothered in extensive carpets of green and purple sea anemones that harbor hundreds of anemonefish. Divers typically circle the rock in a slow spiral ascent, exploring overhangs, soft coral fields, and crevices packed with macro life.

Angthong National Marine Park spans an archipelago of limestone islands in the Gulf of Thailand. Diving centers on northern islets like Koh Yippon and Koh Wao, where karst topography drops beneath the surface into submerged overhangs, shallow caverns, and arches. Dense thickets of black coral bushes and sea whips cover these formations. Nutrient runoff from coastal bays often clouds the water, though soft coral growth and invertebrates compensate for the variable visibility.

Located west of Koh Samui and Koh Phangan, the archipelago of Mu Ko Ang Thong consists of dozens of dramatic limestone islands rising sharply from the Gulf of Thailand. Diving here focuses primarily around the northern boundary at Koh Yippon and Koh Wao, where submerged karst topography creates an intricate network of swim-throughs, undercut ledges, and cavernous overhangs. While water clarity tends to be lower than at offshore pinnacles due to coastal runoff, the nutrient-rich waters sustain expansive gardens of soft corals, massive barrel sponges, and dense schools of coastal fish.

Ao Kluai is a sheltered bay on the Koh Kood coast. Hard coral formations, scattered boulders, and sand patches cover the gently sloping seabed. Dependably calm conditions suit checkout dives, training sessions, and macro searches along the reef edge.

Located in a sheltered bay along the southeastern coast of Koh Surin Tai, this site consists of extensive hard coral slopes that ease into a white sand bottom. Massive Porites colonies, branching staghorn thickets, and table corals dominate the shallows before transitioning into soft coral outcroppings deeper down. Divers drift along the reef line observing active reef species and foraging critters in the rubble patches.

Situated just northwest of Nai Harn in southern Phuket, this small cove features a straightforward shore entry over sand and granite rocks. The underwater landscape consists of granite boulder formations intertwined with scattered hard coral patches and soft coral outcroppings that gradually slope outward to a sandy seabed. It serves as a dependable training ground and a relaxed site for muck hunting and shallow exploration.

Sheltered on the coast of Koh Samae San, this shallow bay features gently sloping coral gardens that transition into a wide sand flat. Divers frequently encounter scattered coral bommies interspersed with sandy patches, making navigation straightforward. The protected topography provides calm water when surrounding open sea sites experience stronger currents.

A sheltered bay on the southeastern side of Koh Tao, Aow Leuk features wide sandy expanses bordered on both flanks by fringing coral reefs. The calm conditions make it a cornerstone location for entry-level training courses and relaxed buoyancy practice. Beyond the natural reef lines, divers often explore artificial reef structures and coral nursery frames placed along the sandy seabed.

Set in a sheltered cove along Koh Phi Phi Leh, this site features marine conservation structures installed over a sandy floor alongside natural fringing hard coral. Divers navigate among concrete cubes, metal nursery frames, and coral propagation trees that attract juvenile reef species and schooling fish seeking refuge from open water.

Situated along the sheltered eastern coast of Koh Racha Noi, Aussie Reef features a gently sloping hard coral field transitioning into granite boulder clusters and open sand. The site offers relaxed drift diving conditions, making it a reliable destination for day trips departing from Phuket or Chalong Pier. Divers frequently encounter resting benthic sharks and rays along the sandy perimeter, while dense schools of reef fish shelter among large Porites and Acropora coral colonies.

Set along the sheltered eastern flank of Koh Racha Noi, Banana Bay features a gently sloping seabed composed of extensive staghorn coral fields and scattered granite boulders that taper off into fine white sand. The calm conditions inside the bay make it a staple for easy navigation, refreshers, and relaxed drift explorations when heading toward the outer points.

Located offshore from Khao Lak, this submerged tin-mining vessel rests on an open sandy seabed. Over time, the decaying metal structure has developed into an isolated artificial reef, concentrating fish life in an area otherwise dominated by barren sand. Divers explore the exterior framework and fallen machinery, observing dense resident schooling fish and diverse macro critters sheltered among the rusted plates.

Positioned just offshore from Sairee Beach on Koh Tao, this purpose-built conservation site features concrete structures, metal domes, and coral nursery frames. Originally deployed by Ban's Diving Resort to alleviate recreational diver pressure on natural fringing reefs, the site provides a sheltered setting for buoyancy practice and marine conservation courses.

Situated along the northeast coast of Koh Racha Yai, Bay 1 serves as one of Phuket's primary dive training locations. Sheltered sandy flats transition into a sloping reef system characterized by hard corals, staghorn thickets, and multiple purpose-built artificial reef installations, including concrete cubes and sunken statues.

Situated along the sheltered eastern flank of Koh Racha Yai, Bay 1 features a gently sloping sand bottom flanked by hard coral reefs and a collection of artificial reef structures. Concrete cubes, statues, and small submerged objects provide focal points for navigation and training across open sand patches.

Rising dramatically from the Andaman Sea south of Phi Phi Ley, this limestone islet offers some of the most varied underwater topography in the region. Dramatic vertical walls drop into sand on the southern and western faces, while the eastern side gives way to a sloping hard coral garden and boulder formations with accessible swim-throughs. Schools of pelagics patrol the open water off the points, and juvenile reef sharks frequent the shallow bays.

Boh Yai Mine is a flooded abandoned lead and zinc mine situated in the forested hills of Kanchanaburi. Technical divers explore a labyrinth of submerged shafts, horizontal transport tunnels, and large excavated chambers. Industrial relics such as ore carts, trackways, structural timbering, and electrical cabling remain preserved in the quiet, low-oxygen depths.

Sunk in the mid-1980s off the coast of Khao Lak, this former tin mining dredger was later fractured into several clusters of steel plating by the 2004 tsunami. It acts as an isolated artificial reef on an expansive sandy seafloor, drawing dense aggregations of juvenile and predatory marine species. Divers often encounter massive clouds of snappers hovering above the collapsed superstructure alongside numerous resident morays tucked into every crevice.

Sunk in the 1930s following a boiler explosion, this German freighter rests upright on a flat seabed off the Sattahip coastline. Decades submerged have collapsed the superstructure, exposing the engine block, boiler assemblies, and scattered hull plates as an artificial reef. Lighter diver traffic compared to inner Pattaya wrecks allows encrusting marine life to colonize the metal framework, while schools of juvenile fish shelter in the ribs and attract pelagic predators from the open channel.

Located off the southern tip of Phuket near Rawai, Buddha Island features submerged granite boulders transitioning into hard coral slopes and sandy patches. The site is named after the monastery and prominent Buddha statue on the adjacent islet. Divers explore sheltered coral gardens populated by reef dwellers, with occasional drift profiles running along the outer rocky edges when tidal flows pick up.

Set along the western coast of Koh Racha Yai, Bungalow Bay features a wide, gently sloping sandy seabed flanked by hard coral reef tracks on both its northern and southern rocky arms. Scattered concrete artificial structures rest on the sand, attracting clusters of juvenile fish and crustaceans. Divers typically navigate along the fringing reef slopes before scanning the open sand for bottom-dwelling species.

Created by the local dive community to alleviate diver impact on adjacent natural reefs, Buoyancy World is an artificial training park set over an expansive sandy plain. Divers navigate concrete blocks, circular swim-through hoops, pyramid frames, and hollow sculptures designed specifically for honing trim and finning techniques. While primarily constructed as a skills arena, algae, soft corals, and juvenile fish have colonised the structures, creating pockets of life away from the heavy traffic of nearby sites.

Camera Bay is situated along the coast of Koh Racha Noi, providing a protected anchorage and diving area sheltered from open swell. The topography features scattered granite boulders interspersed with hard coral gardens that gradually slope onto open sand. Closer to the reef edges and deeper patches, schools of snappers and fusiliers congregate, while the sheltered sandy seabed provides resting spots for bottom-dwelling rays and occasional leopard sharks.

Named for the granite outcrop that breaks the surface resembling an elephant's head, this signature Similan Islands site is an intricate underwater labyrinth. Immense granite boulders rest haphazardly against one another, creating a dramatic network of arches, cavernous swim-throughs, and deep canyons. Pelagic fish patrol the open blue off the drop-offs, while macro life hides in shaded crevices and beneath overhangs adorned with sea fans.

Garang Heng is a submerged limestone pinnacle situated east of the Phi Phi archipelago. The reef crown is carpeted in sea anemones and soft corals before dropping away into sandy plateaus and boulder fields where leopard sharks frequently rest. Because the formation stays entirely underwater without breaking the surface, boat traffic overhead is common, requiring careful ascents directly to the mooring line or deploying a surface marker buoy.

Situated off the northwest tip of Koh Nang Yuan, Green Rock consists of large submerged granite boulders stacked into a labyrinth of swim-throughs, arches, and overhangs. The rock structure emerges just beneath the surface and drops into a sandy seabed scattered with coral outcrops. The northern sandy plateau features a well-known nesting area for triggerfish, where territorial behavior is common during breeding periods.

Situated along the northwest coast of Koh Phangan, Haad Yao features a fringing coral reef that slopes gently into a sandy seabed. Accessible directly from the beach or by longtail boat, the reef structure supports extensive colonies of hard corals punctuated by patches of staghorn and massive porites mounds. The site offers relaxed, unhurried exploration where divers often find macro critters in the rubble zones alongside schooling reef dwellers.

Situated off the southern shore of Koh Larn in the Pattaya Near Islands, Had Nuan features a gently sloping seabed composed of sand flats, scattered coral bommies, and artificial concrete blocks. The sheltered bay provides calm water conditions that serve standard training dives, checkouts, and relaxed reef exploration.

Resting on her starboard side in the Samae San channel, the HTMS Hardeep is a World War II shipwreck sunk by Allied bombers in 1945. Originally the steam cargo vessel SS Suedsakorn, the hull forms an artificial reef where divers explore open cargo holds, the engine room structure, and the propeller shaft. Encrusting soft corals and sponges cover the steel. Strong tidal flows sweep through the channel, requiring dive planning around slack water windows.

Sunk by Allied aircraft during the final months of World War II, this steam cargo vessel lies on its starboard side across a sandy channel off Samae San. The hull has cracked open over the decades, exposing huge cargo holds and the engine room. Large schools of pelagics patrol the open water above the superstructure, while the steel frame supports extensive soft coral growth.

The Harruby (often written Haruby) is a sunken liveaboard wreck located off the shores of Koh Racha Yai. Intentionally sunk after an on-board fire to create an artificial reef, the wooden vessel now sits upright on a sandy seabed. Over time, the wreck has deteriorated into an open structure that offers easy swim-throughs for wreck-certified divers and serves as an oasis for marine life in the surrounding sand flats.

Located off Koh Ha in the Similan Islands, Hideaway Bay features a sheltered sloping reef transitioning into a wide sandy plateau scattered with granite boulders and artificial reef structures. The protected bay provides relaxed diving conditions suitable for training dives and check-out dives, though moving beyond the reef edge exposes divers to open-ocean currents. Hard coral blocks dominate the shallows, while the sandy plain hosts distinct bottom-dwelling fauna.

Hin Bida is a submerged pinnacle system located southeast of the Phi Phi islands in the Andaman Sea. The topography consists of low-lying limestone boulders surrounded by extensive fields of staghorn and table corals that slope gently into surrounding sand plains. The site is widely recognized for frequent resting leopard sharks along the outer perimeter channels.

Hin Bida is a submerged limestone formation located southeast of the Phi Phi Islands. Often referred to as Phi Phi Shark Point, the site features a central rock pinnacle that breaks the surface at low tide, tapering off into fingers of hard and soft coral slopes surrounded by a wide sandy bottom. Divers navigate around the scattered coral bommies and submerged boulders to search for bottom-dwelling sharks and macro critters sheltered among the crevices.

Hin Chedi is a submerged granite pinnacle situated within the Mu Ko Chumphon archipelago. The rock formation tapers upward from a sandy seabed, resembling the profile of a traditional Thai stupa. Gorgonian fans, sea whips, and carpets of sea anemones blanket the structure, which serves as an offshore aggregation point for schooling pelagics and benthic macro life.

Rising from the open ocean south of Koh Lanta, Hin Daeng features towering vertical drop-offs blanketed in soft red corals. The dramatic underwater topography drops sheer on the southern side, while gentle slopes and gullies define the northern and western faces. Because the pinnacle sits exposed far offshore, oceanic currents sweep past, drawing large pelagic visitors alongside schools of jacks and fusiliers.

Rising from the deep open sea south of Koh Lanta, these twin submerged pinnacles form Thailand's premier pelagic encounter zone. Hin Daeng breaks the surface with a small exposed rock outcrop before plunging into vertical walls blanketed in red soft corals, while completely submerged Hin Muang drops into deep abyss adorned with purple dendronephthya corals. Oceanic currents funnel vast concentrations of plankton around both pinnacles, attracting apex filter feeders alongside massive schools of jacks and fusiliers.

Rising from the sandy seafloor south of the Koh Chang archipelago, Hin Gue Dueng is an isolated granite pinnacle carpeted with sea anemones and branching soft corals. Open-water currents wash around the rock, attracting passing pelagic fish that school off the drop-offs. Divers descend along mooring lines onto the top of the formation before circling downward along sheer rocky crevices and granite boulders scattered across the base.

Hin Klai, also known locally as Garang Heng, is a submerged pinnacle reef situated northeast of the Phi Phi archipelago. The reef structure rises from a sandy sea floor toward the surface, crowned with sea anemones and barrel sponges. Because it sits in open water away from the main island mass, it acts as a magnet for schooling pelagics and bottom-dwelling sharks.

Hin Kuak Maa, locally referred to as Three Fingers or Horseshoe Rock, sits within the Mu Koh Chang National Park archipelago south of Koh Chang. The site consists of a submerged granite rock formation rising from a sandy seabed, flanked by hard coral gardens and scattered boulder clusters. Calm conditions and gentle slopes make this a staple destination for day trips departing from Bang Bao pier.

Hin Lak Ngam is an offshore submerged rock formation located within the waters of Chumphon Marine National Park. Large granite boulders rise from a sandy seabed, completely carpeted with sprawling sea anemone colonies and black coral trees. Schools of pelagic fish patrol the surrounding blue water, making it one of the premier open-water pinnacle sites in the northern Gulf of Thailand.

Hin Luk Bat is a prominent granite pinnacle rising from the seabed southwest of Koh Chang in the Gulf of Thailand. Massive submerged boulders surround the main rock formation, creating swim-throughs, overhangs, and sheltered alcoves decorated with sea whips and hard coral gardens. Dense shoals of pelagic fish circle the exposed outer flanks, while the sandy base hosts bottom-dwellers and macro critters.

Hin Muang is a completely submerged oceanic pinnacle located south of Koh Lanta in the Andaman Sea. Named Purple Rock for the dense blankets of soft purple corals encrusting its sheer vertical drop-offs, the site plunges into deep open water. Strong currents frequently sweep the formation, attracting pelagic filter feeders alongside schools of predatory fish.

Hin Ngam sits in a sheltered bay on the southeastern coast of Koh Tao. Massive granite boulders drop away into coral gardens that transition gradually to open sand. The site serves as a frequent location for open water training and night dives due to its calm waters and straightforward navigation.

Hin Paer rises from the sandy seabed off the Chumphon coastline, forming an isolated granite pinnacle surrounded by extensive coral growth. Large carpets of sea anemones blanket the shallower rock terraces, inhabited by dense colonies of pink anemonefish. Down along the deeper boulders and sandy edges, schools of pelagic fish circle the structure in search of prey while stingrays rest on the seabed.

Hin Pee Wee sits just north of the HTMS Sattakut wreck off Koh Tao. This cluster of granite boulders and pinnacles rises from the sandy seabed, covered in anemone beds, sea whips, and hard coral formations. Divers frequently combine the pinnacle with the nearby wreck, using Hin Pee Wee as an extended safety stop area or starting point before navigating across the sand channel.

Hin Raab sits south of Koh Chang as an offshore granite pinnacle structure surrounded by extensive coral gardens and sand patches. Massive boulder stacks create sheltered swim-throughs, crevices, and small overhangs before sloping gently onto the seabed. Coral cover features hard tabular and staghorn formations mixed with extensive carpets of sea anemones. It serves as one of the staple dive sites in the Mu Koh Chang National Park, suitable for training dives while offering enough structural variety for experienced divers.

Hin Tai Nam, frequently logged as Blueberry Hill by local dive operators, is a submerged rock formation in the Koh Chang archipelago. Massive granite boulders form gentle slopes draped in carpets of sea anemones and staghorn formations before giving way to flat sand. The shallow profile and sheltered position make it a relaxed dive, often utilized for training dives and long macro searches.

Set along the east coast of Koh Tao, Hin Wong Bay features underwater granite boulders blanketed with soft corals, seafans, and sea anemones. The bay slopes gently from a sandy shoreline out into deeper patches of boulder clusters and hard coral gardens. Its sheltered orientation offers calmer waters when southwesterly winds stir the island's western dive sites.

Situated off the eastern coast of Koh Tao, this submerged granite formation features a collection of large boulders and pinnacles surrounded by open water. Dense fields of purple and lilac soft corals cloak the rocky faces, thriving in the nutrient-rich currents that sweep past the point. Schools of pelagic fish patrol the deeper perimeters, while smaller critters shelter in granite crevices and sea fans.

Hin Yetti is a submerged granite rock cluster located off the waters of the Koh Kood and Koh Chang archipelago. Hard coral heads and sea whips decorate the massive boulders, which slope down to a sandy seabed frequented by benthic critters. Gentle topography makes navigation straightforward around the main formation, with sheltered pockets providing shelter when currents pick up.

On the eastern side of Koh Miang in the Similan Islands, Honeymoon Bay features a sheltered hard coral slope descending to a white sand basin. Liveaboards anchor in this inlet for refresher dives, afternoon entries, and night dives. Granite boulders flank the bay, yielding to staghorn and pore coral formations.

The HTMS Chang, formerly USS Lincoln County (LST-898), was scuttled off Koh Chang to create an artificial reef. Resting upright on the sand, the landing ship tank features intact exterior structures including the bridge tower, cranes, and gun mounts. Divers with wreck-penetration certifications can navigate the interior cargo decks and corridors.

Sunk intentionally in late 2012 as an artificial reef off the southwest coast of Koh Chang, this former US Navy tank landing ship rests upright on a flat sandy bottom. Divers explore several accessible levels, from the expansive open deck and bridge tower down through cargo holds and engine passageways. Large schools of pelagics and resident predators constantly patrol the superstructure.

Scuttled in 2003 off Koh Phai by the Royal Thai Navy, this former WWII landing ship sits upright on a flat sandy bottom. Prepared specifically as an artificial reef, the hull features purpose-cut swim-throughs across multiple decks, though progressive coral encrustation and silting require attentive buoyancy.

The HTMS Kled Gaeow is a decommissioned Royal Thai Navy transport vessel scuttled east of Phi Phi Leh to establish an artificial reef. Sitting upright on the sandy seabed, the steel hull has become encrusted in soft corals and hydroids, drawing dense walls of pelagic fish and reef predators. Divers typically descend down a mooring line straight onto the wheelhouse before exploring the main deck and exterior companionways.

HTMS Kut is a decommissioned World War II-era Landing Ship Medium scuttled by the Royal Thai Navy off Koh Sak to create an artificial reef. The vessel rests upright on an open sand bed. Divers can explore the expansive cargo deck, pilot house, and gun mounts, which have become heavily encrusted with soft corals, sponges, and hydroids.

Sunk intentionally in late 2012 by the Royal Thai Navy as an artificial reef, the HTMS Mataphon rests upright on a flat sandy seabed just east of Koh Sak. Originally built as an amphibious landing craft, the steel structure now serves as a central hub for marine training and wreck exploration in Pattaya Bay. The wheelhouse and main cargo deck remain largely intact, offering wide access points for divers trained in wreck penetration.

Sunk deliberately in May 2011 as an artificial reef near Koh Ngam Noi off the coast of Chumphon, this former Royal Thai Navy landing craft sits upright on an open sand bed. The vessel's superstructure remains largely intact, featuring open deck spaces, easily navigated corridors, and the decommissioned forward anti-aircraft gun mounts. Over years on the seabed, encrusting corals, barnacles, and black coral bushes have colonized the metal hull, turning the ship into a focal point for schooling pelagics in an otherwise featureless seascape.

Junkyard Reef is a dedicated artificial reef and coral restoration project located just offshore from Mae Haad on Koh Tao. Built initially in the late 2000s to relieve diver pressure on natural coral ecosystems, the site contains an eclectic collection of structures including repurposed steel pipes, car parts, concrete domes, and coral nursery tables. Over time, these artificial foundations have matured into an active nursery and shelter for resident reef creatures.

Situated along the northern headland of Kata Beach on Phuket's west coast, this house reef slopes gently over granite boulders and patch coral formations. Divers typically wade in directly from the sandy shore to explore a mixture of hard corals, sandy channels, and artificial reef cubes. It functions regularly as a training site and an easy muck-and-critter dive when west-coast sea conditions remain calm.

Located off the rocky southern headland of Kata Beach on Phuket's west coast, this shallow coastal reef features granite boulders sloping down to a sandy seabed with scattered hard coral bommies. It is one of the island's most accessible shore dives, popular for training dives, relaxed critter hunting, and night diving when nocturnal marine species emerge from the sand and reef crevices.

Khao Na Yak sits off the coastal headland of Hat Thai Mueang National Park in Phang Nga province. The site consists of shallow granite boulder clusters scattered over a sandy seabed, flanked by hard coral patches. Because of its sheltered bays and modest profile, it serves mainly as a calm training ground, refresher site, and macro-focused local dive along the Andaman coast.

The King Cruiser was an 85-meter passenger catamaran ferry that sank in May 1997 after striking nearby Anemone Reef en route from Phuket to Phi Phi. Resting upright on a sandy bottom, the wreck has deteriorated over time, with the upper decks collapsing inwards to form an expansive artificial reef. The hull and collapsed superstructure provide ample shelter for massive schools of fish, though overhead penetration is no longer advised due to structural degradation.

Ko Haa 3 forms part of the sheltered central lagoon within the uninhabited Mu Ko Lanta National Park archipelago. The underwater landscape transitions from shallow hard coral gardens across the inner side to sloping limestone walls and sandy patches along the outer edge. Divers frequently encounter varied macro life hidden in table corals, alongside cruising pelagics out in the blue.

Set in a sheltered bay enclosed by limestone islets within Mu Ko Lanta National Park, this site features a shallow sandy basin flanked by hard coral gardens and gentle sloping reef walls. Natural protection from open ocean swell creates calm, predictable conditions. Coral bommies scattered across the sand harbor macro critters alongside cruising reef fish, while the outer edges drift into deeper coral slopes.

Koh Bida Nai is the smaller of the two limestone islets south of Koh Phi Phi Leh. Dramatic karst walls plunge into boulder gardens on the eastern and southern flanks, while the western side slopes gently over shallow coral fields. Divers frequently encounter blacktip reef sharks patrolling the shallows alongside resting zebra sharks on the sandy floor, with vibrant gorgonian fans and barrel sponges clustering in the channels between fallen boulders.

Rising out of the Andaman Sea south of Phi Phi Ley, the twin limestone islets of Koh Bida Nok and Koh Bida Nai form one of the premier marine habitats in the region. Underwater, dramatic vertical limestone walls drop into sloping reefs covered in soft corals and gorgonian fans, complemented by shallow hard coral gardens and swim-throughs. Divers frequently encounter schooling pelagics around the exposed points alongside reef sharks cruising along the sandy fringes.

Located north of the main Similan archipelago, Koh Bon stands out as a stark limestone islet rather than the granite boulders found on its southern neighbors. Divers descend primarily onto the dramatic western ridge, a submerged finger of rock that drops away into deep blue water and acts as an active cleaning station for pelagics. Plankton-rich currents sweep across the wall, supporting yellow soft corals, sea fans, and abundant schooling fish.

Koh Bon sits north of the main Similan chain, characterized by perforated limestone cliffs and a submerged western ridge that drops off into open water. Ocean currents sweeping past the point concentrate plankton, making it one of the premier cleaning stations in Thailand for pelagic visitors.

Situated within the Samae San archipelago south of Pattaya, Koh Chan offers sheltered diving around shallow rocky reefs and sloping sandy beds. Hard coral formations such as massive porites and table corals dominate the shallows, transitioning into patches of soft corals and barrel sponges deeper down. Divers frequently encounter varied reef fish foraging among the rocky outcrops and anemone fields.

Located in the Samae San archipelago south of Pattaya, Koh Chuang features sloping rocky reefs, extensive coral gardens, and scattered boulder formations. The island acts as a natural shelter depending on wind patterns, though tidal currents running through the surrounding channels can pick up rapidly.

Rising vertically out of the Andaman Sea between Phuket and the Phi Phi Islands, Koh Doc Mai is a limestone monolith famed for wall and macro diving. The eastern flank features sheer drop-offs covered in dense clusters of yellow tube corals and expansive gorgonian sea fans, alongside two cavern openings that can be explored near the base. Divers drift along the dramatic rock face, peering into crevices where critters shelter from passing tidal currents.

Koh Haa forms a cluster of five limestone islets within Mu Ko Lanta National Marine Park. Underwater, towering karst walls give way to a central sheltered lagoon, swim-throughs, and extensive cavern systems such as The Cathedral, where divers can surface inside an air chamber illuminated by ambient green and turquoise light.

Koh Haa forms a cluster of five limestone islets in the Andaman Sea, renowned for dramatic underwater topography including swim-throughs, caverns, and healthy hard coral gardens. The central lagoon offers calm conditions surrounded by shallow reefs, while outer walls descend into deeper water. Famous features like The Cathedral allow divers to explore interconnected chambers where ambient sunlight filters down from the surface.

Koh Haa forms a cluster of five limestone islets rising sharply from the Andaman Sea within the Mu Koh Lanta National Marine Park. Underwater, the karst topography plunges into vertical walls, vast sandy basins, and an extensive system of caverns and swim-throughs. The central lagoon offers shallow coral fields sheltered from open ocean swell, while the outer pinnacles drop toward deeper water where pelagics cruise past.

Set within a sheltered natural amphitheater formed by three limestone islets, Koh Ha Lagoon features a flat sandy basin dotted with hard coral bommies, soft coral patches, and shallow reef margins. Divers explore the sandy bowl searching for macro critters before following the sloping reef outward toward the rocky island walls. The protected topography creates calm conditions well suited for training, refresher dives, and relaxed navigation.

Situated along the sheltered lee of Koh Klung Badan in Pattaya's Far Islands, this bay features a gently sloping seabed scattered with massive Porites coral heads, table corals, and sprawling staghorn thickets. Divers explore patches where rocky outcroppings meet wide sand flats, providing ample hiding spots for bottom-dwelling critters. The site often serves as a calm anchorage when outer island sites experience rougher swells.

Located off the southern tip of Koh Klung Badan in Pattaya's Far Islands, this site features a sloping coral reef that gives way to a sandy seabed. Divers drift along boulder formations and patches of table corals while exploring sheltered recesses that harbor juvenile fish and benthic critters.

Situated in the Pattaya Near Islands chain, Koh Krok features a gently sloping coral reef bordered by sandy flats. The eastern flank commonly serves as a drift dive when tidal currents pick up, carrying divers past extensive colonies of staghorn corals, sea anemones, and scattered boulder formations.

Situated within the Mu Koh Rang marine sanctuary off Trat province, this sheltered islet offers a relaxed dive over sloping hard coral gardens and scattered granite boulders. Massive Porites coral heads and expansive fields of staghorn corals dominate the reef floor. Gentle waters make it a staple destination for Koh Chang and Koh Mak dive boats seeking easy navigation and steady conditions.

Located off Mae Haad Beach on the northwestern tip of Koh Phangan, Koh Ma is a small islet connected to the mainland by an exposed sandbar at low tide. The fringing reef descends gradually into sandy patches littered with hard coral bommies, sea whips, and anemone fields. Divers explore the southern and western slopes where submerged boulders create small crevices inhabited by macro life and juvenile reef fish.

Koh Man Klang lies in the Eastern Gulf of Thailand as part of the Man island cluster off the coast of Rayong. Diving here focuses on the fringing reefs and scattered granite boulders that slope gently towards open sand. The site features a mix of hard coral gardens, sea anemone patches, and shallow rubble zones that serve as nurseries for coastal marine species.

Finger Reef lies on the sheltered side of Koh Manwichai within Pattaya's Far Islands chain. The site is named for several distinct finger-shaped hard coral and rock ridges that extend perpendicular from the island's coastline down toward a sandy sea floor. The protected topography makes it a mainstay for both training dives and relaxing reef explorations, surrounded by scattered porites coral heads, sea anemones, and soft coral patches.

Within Mu Ko Chumphon National Park, Koh Ngam Noi rises as a limestone islet framed by submerged boulder formations and sheer drop-offs. Sea anemone carpets cover the rock faces, sheltering dense colonies of anemonefish. Lower diver traffic compared to outer Gulf islands keeps the black coral bushes, gorgonian fans, and barrel sponges intact. Fusiliers and jacks patrol the exposed corners where currents sweep past the reef.

Koh Ngam Yai is a rugged limestone island situated within the Mu Ko Chumphon National Park. Its underwater topography features sheer karst walls, crevices, and submerged boulders carpeted in sea anemones and branching yellow whip corals. Schools of pelagics circle the outer drop-offs, while macro critters shelter in rock fissures along the shallower flats.

Located among Pattaya's Far Islands, Koh Pai features shallow fringing coral reefs alongside sandy channels and scattered granite boulders. Sheltered bays around the uninhabited island provide gentle conditions suitable for training dives, while the seaward slopes attract cruising pelagics and benthic marine life.

Limestone monoliths drop beneath the surface into boulder fields, overhangs, and soft coral gardens around Koh Phi Phi. Divers navigate submerged swim-throughs and sea fan slopes where pelagics cruise alongside macro critters sheltering in craggy rock crevices. Plankton blooms can reduce water clarity during tidal shifts, yet they draw schooling fish and feeding rays along the outer walls.

Situated off the western coast of Koh Kood, Koh Reath features a sheltered fringing reef flanking rocky outcroppings and shallow sandy bays. The topography transitions from shallow coral gardens composed of massive Porites and staghorn formations to scattered granite boulders on the outer perimeter. Divers and snorkelers also encounter submerged concrete animal statues placed along the seabed to promote artificial habitat development.

Situated among the Pattaya Far Islands in the Gulf of Thailand, Koh Rin offers some of the healthiest reef structures in the region. The island features sheltered bays alongside rocky outcroppings like North Rock and South Rock. Sheltered reefs give way to sloping sand channels and massive coral bommies where macro critters and larger reef species seek refuge.

Located within the Mu Ko Lanta National Park, Koh Rok comprises twin limestone islands separated by a sheltered marine channel. The underwater landscape features gently sloping hard coral gardens transitioning into scattered boulder formations and coral walls. Dense thickets of branching staghorn corals and massive pore corals cover the seafloor alongside sea anemones, attracting an assortment of reef fish and cruising pelagics.

Situated within the Samae San archipelago, Koh Rong Khon is a small rocky islet surrounded by granite boulders and coral slopes. The site is sheltered during parts of the tidal cycle but experiences shifting water movements through the island passage. Underwater, fields of sea anemones blanket the shallower rocks, while deeper sectors give way to whip corals, barrel sponges, and gorgonian fans anchored among massive stone formations.

Located off the outer edge of Koh Sak in the Pattaya Near Islands archipelago, this site slopes from shallow fringing coral heads down into a sandy seabed dotted with artificial structures and scattered bommies. Divers encounter gorgonians, whip corals, and extensive patches of staghorn coral along the deeper fringe.

Situated along the eastern side of Koh Sak in the Pattaya Near Islands, this sheltered site features a gently sloping seabed transitioning from shallow hard coral patches to open sand. Divers frequently encounter macro critters tucked among the coral heads and mooring blocks, while training groups take advantage of the calm conditions.

Off the western fringe of Koh Sak near Pattaya, a gentle slope transitions from scattered coral bommies to sandy flats. Calm conditions suit training sessions, while muck divers scour the seabed for camouflaged macro life. Brain and pore corals populate the shallower reef, giving way to sand dotted with rubble and artificial structures.

Koh Sii is a limestone islet located among the Ao Nang local islands off Krabi. Underwater, the steep karst walls plunge into a seabed dotted with massive boulders, forming narrow swim-throughs and sheltered overhangs. Large sea fans and patches of soft coral cling to the rock faces, while sandy gullies between the formations host benthic critters.

Submerged granite domes rise off the southern tip of Koh Tachai, forming a dynamic offshore plateau subject to energetic currents. Divers descend along mooring lines to granite boulders blanketed with sea fans, feather stars, and fields of hard corals. The open-ocean location draws pelagic species that patrol the perimeter while dense schools of trevally hunt along the reef crest.

Koh Tachai sits in the northern reaches of the Andaman marine park system, celebrated primarily for its offshore granite plateau known as Tachai Pinnacle. Submerged dome-shaped boulders create an undulating underwater landscape draped in seafans and hard coral formations. Because the pinnacle sits exposed to open sea, currents can be fierce, funneling nutrient-rich water that attracts large pelagic species and dense schools of hunting predators.

Situated off Koh Lipe in the Tarutao National Marine Park, Koh Talang Steps is characterized by dramatic terraced granite boulders descending onto a sandy seabed. These underwater stone tiers create natural shelters and overhangs that harbor macro life alongside sweeping branches of colorful soft corals and sea fans. Tidal movement through the channel brings nutrient-rich currents, fueling dense fish activity around the outer edges of the reef.

Situated in the western Gulf of Thailand, Koh Tao is defined by granitic underwater boulder formations, coral nurseries in protected coves, and outlying submerged seamounts. While inner bays provide calm water for training, outer pinnacles pull in pelagic visitors when currents run.

Set within the Mu Ko Chang National Park archipelago, Koh Thian features shallow sloping reefs that flank the rocky islet. Large Porites coral heads and dense patches of staghorn coral cover the seabed, transitioning into sand flats dotted with sea anemones. Calm surface conditions and gentle gradients make it a staple for day boats departing from Koh Chang and Koh Kood.

Situated just off the eastern coastline of Koh Lipe, Koh Usen is an islet fringed by sloping hard coral reefs and granite rock clusters. The shallows feature extensive beds of branching staghorn corals and sea anemones that transition into sandy patches where bottom-dwellers hunt. Because of the sheltered topography and easy navigation along the reef contour, dive operators frequently use the site for refresher dives, training sessions, and relaxed night excursions.

Located within the protected waters of Mu Ko Chang National Park south of Koh Rang, Koh Yak is a small rocky islet ringed by shallow hard coral gardens. Large boulder clusters on the deeper edge give way to sandy patches where rays rest, while dense staghorn and table coral formations cover the sunlit shallows. The calm conditions and gentle slope make it a favored spot for relaxed exploration and macro photography.

Situated north of Koh Lipe within Tarutao National Marine Park, Koh Yang offers sloping rocky reefs intermixed with sprawling hard coral formations. Granite boulders dominate the shallower zones before transitioning into sandy seabed edges where bottom-dwellers hunt. The site is sheltered from severe open-ocean swell on typical days, though currents through the island channels occasionally pick up during tidal changes.

Koh Yawabon is a distinctive limestone karst islet situated among the local islands off the coast of Ao Nang in Krabi. Divers visit primarily for its famous underwater swim-through tunnel that cuts directly through the island's rock base, flanked by soft coral fields and rocky boulder formations.

Located among the Krabi local islands offshore from Ao Nang, Koh Yawasam features limestone rock formations sloping into a gentle sandy bottom with scattered coral heads. Divers frequently encounter leopard sharks resting on the sand, while crevices across the reef provide shelter for macro creatures and schooling reef fish. The shallow, sheltered profile makes it a regular stop for local day boats and training dives.

Rising off the coast of Chumphon, this limestone islet is famous for extensive fields of sea anemones and dense patches of black coral. Submerged ridges and boulder clusters drop into sandy channels where schooling pelagics frequently sweep past.

Rising abruptly out of the western Gulf of Thailand off the coast of Chumphon, this limestone islet is famous for dramatic underwater topography and frequent pelagic encounters. Submerged walls and dramatic swim-throughs are blanketed in yellow anemones and dense patches of black coral, with dense baitfish schools drawing apex predators from open water.

Situated along the remote eastern coast of Koh Tao, Laem Thien is famous for its labyrinthine topography. Towering granite boulders plunge down to a sandy seabed, forming deep chasms, swim-through arches, and caverns to explore. While the bay area presents gentle sloping hard coral gardens, the outer point challenges divers with overhead swim-throughs and occasional currents.

Hin Lak Bet, commonly referred to as Shark Fin Rock, is a granite pinnacle rising from the seabed south of the Samae San archipelago. Below the surface, steep boulder formations drop off into sandy plains, supporting dense patches of sea anemones, gorgonian sea fans, and soft coral gardens. Given its exposed offshore position in the Gulf of Thailand, oceanic currents regularly sweep around the rock, attracting schooling pelagics while providing habitat for macro critters in rock crevices.

Set off the northeastern corner of Koh Tao below an old navigation tower on the cliff above, Lighthouse Bay offers a sheltered haven with shallow coral gardens and scattered granite formations. Divers follow massive submerged boulders that taper into sandy flats, navigating fields of staghorn coral, massive brain corals, and sea anemone colonies. The bay serves as a dependable training ground and a relaxed site for easy navigation drills.

Situated southeast of Phuket, Mai Thon Island features sloping fringing reefs, scattered coral heads, and submerged concrete cube modules on the sandy bottom. The leeward side provides sheltered diving conditions, while resident pods of Indo-Pacific dolphins frequently surface along the transit route.

Situated along Koh Racha Noi south of Phuket, Manta Bay features a gently sloping granite-and-coral reef transitioning into a wide sandy plateau. The location serves as a frequent feeding area and cleaning station for oceanic wanderers passing through the Andaman Sea. Divers drift along scattered hard coral formations, staghorn fields, and granite boulders while watching the blue water for pelagic visitors.

Located on the western flank of Koh Racha Noi, this dive site features giant granite boulders tumbling down into deep sand, creating numerous crevices and sheltered swim-throughs. The protected bay area gradually slopes into deeper water, where outer currents attract pelagic visitors. Sandy channels between the massive formations host colony-dwelling species, while the rock faces support hard coral growth and gorgonian sea fans.

Sitting off the limestone cliffs near Phi Phi Don, Monkey Reef slopes gently over a seabed composed of hard coral formations and open sand patches. Massive Porites bommies and branching staghorn thickets dominate the shallow shelf. The site remains well-protected from open-sea swells, providing an easy environment where divers frequently observe reef fish, cruising coastal predators, and macro critters resting among coral crevices.

Situated off the northern tip of Koh Bangu (Island Nine), North Point features an expanse of massive granite boulders that tumble down into deep sand channels. The submerged rock architecture creates swim-throughs, overhangs, and deep crevices lined with sea fans and soft corals. Due to its exposed position, pelagic visitors regularly cruise by the outer edges while reef life aggregates in the sheltered pockets between the monoliths.

Tucked along the southwest coastline of Phuket, this sheltered cove features sloping granite boulders interspersed with hard coral formations and sandy patches. Divers typically explore the boulder ridges where crevices harbor macro subjects, small crustaceans, and resting reef fish. Because it sits away from the main resort strips, boat traffic remains lighter than at central Phuket bays, though swell can build quickly when western winds pick up.

Situated along the western limestone flanks of Koh Phi Phi Leh, Palong Wall features vertical rock faces that slope down into hard coral gardens and open sand. The site is known for dependable encounters with resident blacktip reef sharks patrolling the upper reef plateau. Hawksbill turtles frequently graze among the sea fans and sponges lining the crevices, while schools of yellowtail fusiliers sweep along the outer wall face.

Rising dramatically out of the Andaman Sea, the limestone cliffs of the Phi Phi archipelago extend deep underwater into steep walls, cavernous swim-throughs, and sloping coral gardens. Divers encounter vibrant gorgonian sea fans clinging to karst rock alongside fields of barrel sponges and anemones. The area acts as a vital marine sanctuary where pelagic wanderers frequently cross paths with reef-dwelling regulars.

Located along the eastern coast of Koh Phi Phi Leh, this site tracks the sheer limestone cliffs that plunge beneath the surface. Divers drift along a steep wall adorned with sea fans and soft corals before the topography transitions into a sloping sand bed dotted with large coral bommies. It serves as a dependable spot for encounters with coastal marine life, offering relaxed navigation along the island boundary.

Pottery is a sheltered reef site located along the southwest coast of Koh Tao, featuring submerged granite boulders scattered across a sandy seabed with hard coral formations and artificial reef elements. Given its mild conditions and shallow profile, it frequently serves as a relaxed training location, navigation practice ground, and dusk or night dive spot where nocturnal critters emerge from the rubble.

Lying south of Phuket, Racha Noi is uninhabited and known for dramatic granite boulder formations reminiscent of the Similan Islands. Submerged pinnacles, sweeping drop-offs, and sheltered eastern bays offer varied profiles across the island. The site often attracts pelagic visitors passing through open Andaman Sea currents.

Located south of Phuket, this granite island features massive submerged boulders, dramatic drop-offs, and sloping hard coral reefs. The outer pinnacles attract pelagic visitors from the open Andaman Sea, while sheltered bays along the eastern coastline offer calmer conditions over sandy bottoms.

Situated south of Phuket, Koh Racha Yai offers sheltered bays and gentle sloping reefs that suit both entry-level training and relaxed drift diving. The island features several discrete dive spots, ranging from shallow sandy coves like Siam Bay and Bungalow Bay to hard coral reefs and artificial structures along the eastern shoreline. Concrete cubes, motorcycle frames, sunken sculptures, and several small purposely scuttled wrecks create artificial habitat across the sandy bottom.

Located south of Phuket, Racha Yai Island features sheltered sandy bays, sloping hard-coral gardens, and purpose-sunk artificial reefs. Granite boulders break up expanses of staghorn coral on the outer edges, providing habitat for schooling pelagics and reef residents alike. Calm conditions in the bays serve as the primary training grounds for regional dive centers, while deeper outer reefs and small wrecks offer gentle drift dives for experienced divers.

Located off the northeastern coast of Koh Nang Yuan near Koh Tao, Red Rock is a granite pinnacle rising from the seabed close to the surface. Divers typically descend along the pinnacle wall before navigating southward toward the adjacent reef and swim-through systems that connect toward Japanese Gardens.

Richelieu Rock is an isolated limestone pinnacle rising from a sandy seabed in the Andaman Sea, just south of the border with Myanmar. Its horseshoe-shaped formation features steep walls, crevices, and ledges carpeted in vivid purple soft corals and sea anemones. Because it sits far offshore without shelter, open-ocean currents sweep past the rock, drawing massive schools of pelagic predators alongside rare macro critters sheltered in the crevices.

Rising from the seabed between Koh Tao and Koh Phangan, this exposed granite pinnacle forms an isolated offshore haven in the Gulf of Thailand. Dense schools of chevron barracuda and bigeye trevally circle the main rock formation, while a renowned vertical swim-through known as The Chimney allows divers to enter at depth and ascend through the core of the stone.

Located off the coast of Sattahip in the upper Gulf of Thailand, Samaesan offers an energetic mix of historical shipwrecks and rocky island reefs. The area is famous for the Hardeep, a sunken World War II cargo vessel covered in soft corals and sponges. Diver traffic here often contends with notable tidal flow moving between the offshore islands, creating nutrient-rich feeding grounds across the granite boulders and sloping sand bottoms.

Shark Fin Rock is a submerged granite pinnacle system rising from the sandy seabed in the Samae San area. Granite boulders form swim-throughs and crevices covered in encrusting corals, barrel sponges, and sea whips. Currents around the formation attract pelagics alongside bottom-dwelling species that seek shelter in the rocky cracks.

Shark Island is an uninhabited granite outcrop situated southeast of Koh Tao, named for its dorsal fin-like profile above the surface. Submerged granite boulders tumble down to sandy bottoms, creating sweeping landscapes covered in vibrant purple soft corals, sea whips, and encrusting sponges. Stronger currents frequently wash the deeper edges, drawing pelagic visitors while shallower sections offer sheltered coral gardens.

Situated on the northern side of Koh Racha Yai, Siam Bay features a wide sandy seabed dotted with patch reefs and deliberate artificial installations. Divers frequently head out to locate the submerged concrete statues, including large guardian figures and life-sized elephants sunk to relieve pressure on natural reefs. The bottom slopes gradually away from the sheltered beach into deeper water, providing an uncluttered navigation route over open sand where benthic species often hide.

Located in the Andaman Sea off the coast of Phang Nga province, this archipelago features two distinctly different underwater landscapes depending on the side of the islands you explore. The eastern slopes host extensive hard coral gardens and gentle sand flats, whereas the exposed western and northern sites showcase colossal granite boulders stacked into dramatic swim-throughs, arches, and deep canyons swept by ocean currents. The national park operates under seasonal closures to protect the marine ecosystem, opening only during the calm northeast monsoon.

Located off Koh Bangu in the northern reaches of the Similan archipelago, this site features a sloping hard coral reef that drops into a sandy seabed dotted with granite boulders. Immense aggregations of schooling fish hover along the reef contour, seeking shelter among staghorn corals and sea fans as pelagics pass in the blue.

Located off Koh Miang (Island No. 4) in the Similan archipelago, this site extends along the sheltered eastern shoreline just south of the bay. The underwater landscape features hard coral slopes interspersed with granite boulders that give way to a sandy sea floor, offering a relaxed environment for both day dives and night excursions.

Located off the southern tip of Koh Larn near Pattaya, this site features a mixed substrate of rocky outcroppings, coral clusters, and an expansive sandy floor. Divers drift along the boulder formations where marine life congregates in crevices and coral bommies. Visibility varies with the tidal cycle, but calm conditions make it a regular destination for training and leisure dives alike.

South Reef extends along the southern flank of Koh Tachai, offering a more sheltered alternative to the island's exposed northern pinnacle. Sloping fields of hard coral give way to scattered granite boulders and a sandy floor where bottom-dwelling species rest. Currents sweep past the southern tip, attracting pelagic fish to hunt along the reef edge.

Located off the southern end of Koh Racha Noi, South Tip is a premier open-ocean pinnacle dive in the Andaman Sea. Massive granite boulders cascade down toward the seabed, forming dramatic swim-throughs, stepped ridges, and deep drop-offs. Because the site sits fully exposed to oceanic currents, it serves as an aggregation point for large pelagics, though the surging water requires careful buoyancy management and solid deep-diving comfort.

Southwest Pinnacle is one of the premier offshore sites around Koh Tao, consisting of a series of granite seamounts anchored on an open sandy seabed. Massive carpet anemones blanket the shallower rock crests, bustling with pink anemonefish. Further down the granite flanks, large predatory fish patrol the open blue, making it a reliable spot for encounters with schooling pelagics and passing giants.

Located southwest of Koh Tao, this offshore granite formation features a series of submerged rock pinnacles stepping down into the surrounding Gulf of Thailand. The shallower peaks are blanketed in dense carpets of sea anemones inhabited by pink anemonefish. Divers often circle the main pinnacle before navigating across the sand channels to explore the outlying satellite rocks, where schools of pelagic hunters congregate in the blue.

Located off Koh Lipe in the Tarutao National Marine Park, Stonehenge consists of a cluster of towering granite pinnacles that rise from a sandy seabed. The massive rock formations are carpeted in soft purple, pink, and white dendronephthya corals that open fully when tidal currents sweep past. Schools of pelagic fish circle the pinnacle summits while macro critters seek shelter in the deep crevices.

Located off the coast of Koh Sak in Pattaya's Near Islands group, this site gets its name from a tourist submarine operation that historically frequented the area. The seabed features a mix of natural hard coral clusters, sandy patches, and scattered artificial structures placed to attract marine life. Sloping gradually away from the island, the sheltered topography makes it a mainstay for training dives and relaxed second dives.

Mu Ko Surin National Park features extensive fringing hard coral reefs, sheltered turquoise bays, and granite boulder fields in the northern Andaman Sea. Green turtles and hawksbill turtles frequently forage across the shallow flats, while sheltered reefs host abundant clownfish colonies and schools of bumphead parrotfish. Dives across the archipelago span calm reef slopes in protected bays to exposed outer rocky pinnacles influenced by shifting tidal currents.

HTMS T11 is a retired Royal Thai Navy patrol boat scuttled in late 2013 to create an artificial reef off Koh Chang. Sitting upright on a flat sand bottom, the wreck remains largely intact, allowing divers to inspect the deck machinery, wheelhouse, and external hull structures without dealing with extreme depths. Its compact size makes it simple to circumnavigate on a single tank, making it a regular training wreck for local dive centers.

Situated along the east coast of Koh Tao, this sheltered bay slopes gently from a sandy shore into granite boulder formations and coral bommies. Several artificial reef structures and nursery frames sit along the outer perimeter, giving divers distinct zones to navigate without dealing with strong drift.

Thale Song Hong is a deep, flooded karst sinkhole situated in southern Thailand. Widely recognized as one of the premier technical diving proving grounds in Southeast Asia, the lake features steep underwater walls that plunge into an extensive, dark cavern system. In the sunlit shallows, submerged logs and freshwater vegetation fringe the rim, while the bottom drops steeply into deep overhead environments requiring rigorous cave and trimix protocols.

The Bida Islands—comprising Koh Bida Nok and Koh Bida Nai—form the southernmost tip of the Phi Phi archipelago. Sheer limestone cliffs plunge beneath the surface into extensive boulder labyrinths, vertical walls draped in soft corals, and sloping coral gardens. Divers regularly encounter cruising blacktip reef sharks in the shallow bays, while leopard sharks rest on the deeper sandy stretches bordering the reefs.

Located along the eastern coast of Koh Bangu in the Similan Islands, Three Trees takes its name from a distinctive trio of trees visible on the shoreline above. The underwater terrain transitions gently from a shallow hard coral garden into a sandy slope dotted with massive granite boulders, sea fans, and soft coral colonies. Divers usually drift lazily southward along the reef profile while inspecting the sandy bottom for resting rays and garden eel colonies.

Located off the western flank of Island 8 in the Similan archipelago, Turtle Rock takes its name from both a turtle-shaped surface rock formation and the sea turtles frequently seen grazing along the reef. Underwater, the site features a classic Similan landscape of tumbled granite boulders stacked to form swim-throughs, overhangs, and deep canyons. Sheltered crevices shelter dense patches of soft corals and sea fans, while the surrounding sand flats host benthic rays and garden eels.

Situated off the western coast of Koh Nang Yuan, Twins consists of granite boulders encrusted in hard and soft corals separated by sandy channels. The shallow topography makes it one of the most frequently visited training and pleasure sites around Koh Tao. Divers navigate between distinct reef clusters, where resident anemonefish and juvenile reef species shelter in table corals and rocky crevices.

Located along the eastern coast of Koh Phi Phi Leh, Viking Bay features a gently sloping coral reef alongside an artificial reef project made of concrete cubes. The site provides sheltered conditions sheltered from prevailing western swells, making it a reliable training and relaxed exploration zone. Divers navigate between healthy coral bommies, scattered boulders, and artificial nursery blocks that attract a steady congregation of coastal marine life.

Situated along the northeastern coastline of Koh Phi Phi Leh, this sheltered site features sloping coral reefs, scattered boulders, and an artificial reef project made of concrete cubes. Divers frequently navigate between natural hard coral formations and the stacked structures, which have evolved into nurseries for reef critters.

Western Ridge extends outward from the southwestern point of Koh Bon, forming a stepped limestone finger that descends into open ocean. While the northern flank drops steeply into deep water, the southern face steps down in terraces covered in soft corals and sea fans. This distinct underwater headland acts as a natural gathering point for pelagic feeders and hosts one of the region's primary cleaning stations.

Located off the northwest corner of Koh Pabu in the Similan Islands, West of Eden combines granite boulder formations with sloping coral gardens. Giant sea fans cling to sheer rock faces alongside shelves of table corals, while deep sand channels provide natural lanes for cruising pelagics. Swimmers frequently encounter swift currents that sweep plankton across the outer drop-offs, making it a hotspot for both macro life and hunting predators.

White Rock sits off the western coast of Koh Tao, featuring two prominent granite pinnacles flanked by extensive coral gardens and sandy channels. Divers navigate around massive submerged boulders covered in hard corals, traversing soft-bottom alleys where macro critters shelter. The site serves as a staple for day excursions as well as dusk and night dives, when nocturnal predators emerge to hunt across the reefs.

Wreck T.94 is a decommissioned Royal Thai Navy patrol boat scuttled off the coast of Samae San to create an artificial reef. The vessel rests upright on a sandy bottom, offering an accessible wreck profile for divers transitioning into wreck diving. Coral colonization is steadily advancing along the railings and wheelhouse, while schools of fish congregate around the superstructure.

Located in southern Phuket between Promthep Cape and Windmill Viewpoint, Ya Nui Beach serves as an accessible shore dive characterized by shallow granite outcrops, coral bommies, and sandy patches. Divers commonly explore along the northern rocky headland or navigate toward the small islet sitting just offshore in the bay. The site is frequently used for refresher dives, training sessions, and relaxed macro hunting.