Koh Tachai is the second island to be found on the way from the Similans to Richelieu Rock. Apart from the pristine white sandy beach, the island offers the best diving in this area.
The main reef plateau, 'The Dome' is located approximately 700 metres south off the island and is completely submerged.
The reef offers a plethora of colorful soft, hard and fan corals in combination with rock and boulder formations.
Big schools of barracuda and batfish are regular sightings here and from time to time even the gigantic whale shark finds its way to Koh Tachai.
On the top of the dome look for camoflague experts like the stonefish, find the rare oceanic triggerfish or watch the batfish being cleaned.
Depth: 10 - 35m
Viz: 15 - 40m Currents: Can be strong Getting there : Liveaboard or speedboat Best months: Oct / May
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