Dive-site story
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.
Submerged granite boulder plateau featuring large swim-throughs and sea fan gardens
Regular oceanic manta ray and whale shark encounters during the dry season
Vast swirling schools of chevron barracuda and bluefin trevally patrolling the reef crest
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
The marine park is strictly open during the dry northeast monsoon, with peak pelagic activity occurring in the later months of the season.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Oceanic Manta RayMobula birostris | Seasonal | ||||||||||||
| Whale SharkRhincodon typus | Seasonal | ||||||||||||
| Chevron BarracudaSphyraena qenie | Common | ||||||||||||
| Giant TrevallyCaranx ignobilis | Common | ||||||||||||
| Zebra SharkStegostoma tigrinum | Common |
Marine forecast
