Dive-site story
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.
A scenic swim-through archway on the southeastern side filled with glassfish and soft corals
Regular blacktip reef shark patrols in the shallow reef plateaus
Sandy bottom patches hosting resting zebra sharks and blue-spotted stingrays
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
Peak conditions align with the dry northeast monsoon, offering the calmest seas and highest visibility.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Blacktip Reef SharkCarcharhinus melanopterus | Common | ||||||||||||
| Zebra Shark (Leopard Shark)Stegostoma tigrinum | Common | ||||||||||||
| Hawksbill Sea TurtleEretmochelys imbricata | Common | ||||||||||||
| Yellowtail BarracudaSphyraena obtusata | Common | ||||||||||||
| Ornate Ghost PipefishSolenostomus paradoxus | Seasonal |
Marine forecast
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