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Koh Tachai

Koh Tachai Pinnacle

Also known as "The Dome" is situated just off Koh Tachai Island and is a Mecca for marine life.


The Dome is a submerged pinnacle made up of gigantic granite boulders reminiscent of Similan Island site. The top of the pinnacle is at 14 - 12meters and has a buoy for safe descent. The southern pinnacle is bigger, at a diving depth of 12 metres to the top. It is a dome shape surrounded by large boulders. The sand bottom is at a depth of around 30 to 40 metres, with the deepest area on the southern side. To the west you will find large boulders, some of which have formed swim-throughs. In the east, you will find stacks of small rocks, most of which are covered by hard corals and sea whips. Colourful soft corals and sea fans dominate the northern area of the site. The top of the pinnacle is a wide flat plain with bush and mountain coral. This huge pinnacle links to the smaller second pinnacle with sand patch at 24 metres. From the southern pinnacle, it is about a 50 meter swim to the northern pinnacle. The top of the northern pinnacle lies at a depth of 18 meters. This smaller pinnacle comprises a wide range of rock clusters and is home to large sea fans and corals, that are covered in glass fish and often huge schools of barracuda are hanging out in the blue, out in the sand are Bent Stick Pipefish, Leopard sharsk, passing Manta Rays and Whalesharks are also frequent visitors to both pinnacles.

Type of Dive: Boulder
Depth: 12 - 40 metres diving depth
Visibility: 10 - 30 metres
Temperature: 27 - 29 degrees C
Difficulty: Intermediate / Advanced



Koh Tachai