Liveaboard Advisor

Andaman Sea

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Visit the best dive sites at the Andaman Sea.
Similan islands, Koh Bon, Koh Tachai, Richelieu Rock and Boonsung wreck.

Similan islands

The Similan Island in the Andaman Sea, forms an area of great natural beauty and were declared a Marine National Park in 1982. Consisting of nine, densely wooded islands fringed with rocky outcrops washed by a clear blue tropical ocean and blessed with fine talcum powder-like beaches, the Similan Islands provide the most beautiful and diverse dive.

Explore the huge granite boulders, caverns, swim-troughs and 5000 years old coral reefs which produce a fascinating underwater landscape which attracts a huge variety of marine life, from tiny creatures to great Manta Rays and whale sharks. Water clarity is excellent and the scenery varies with each island.

Koh Bon

Koh Bon is remote uninhabited island which recently added to the Similan Iislands National Park . It’s located 20 kilometer north of Similan Island No 9. The island has no beaches and is in the shape of a horseshoe. Both above and below the surface the waves surge through holes that they have cut right through the island. The breathtaking scuba dive underwater terrain on the southwestern point has a step-down ridge that carries on to depths of over 45m.

The western side of the ridge is more of a gentle slope with coral bommies forming mushroom-like formations out of the finger corals. On the ridge itself, seafans of different sizes, shapes and colors grow, and schooling fish swim in the current feeding. This perfect feeding ground for manta rays, gives you your best chance of seeing and diving with them in the whole of the Andaman Sea. 

Koh Tachai

Koh Tachai is a small uninhabited island about halfway between the Surin and the Similan islands.
The main features of diving here are its submerged pinnacles, large boulders and excellent wildlife. The top of the reef is build with excellent specimens of hard coral while deeper parts are known to have many boulders, sea mounts and sea fans. It’s a good place to spot white tip reef sharks, nurse sharks, manta rays and the king of all marine animals, the whale shark. Other more common species such as large schools of barracuda, Napoleon wrasses, yellow-backed fusiliers and banner fish can be found in huge numbers.
Richelieu Rock
Richelieu Rock is a small submerged rock. As part of the Surin National Marine Park it’s located about 18 kilometers east of the islands themselves.
Richelieu Rock is world famous for of being one of the best places in Thailand to see Big Pelagic's like Whale Sharks and Manta Rays. This huge pinnacle climbing dramatically from the depths of the Andaman Sea is covered soft corals and attracts huge fish like barracudas and groupers ,there is also an incredible array of small fish .
Boonsung wreck
About 7 nautical miles off the coast of Khao Lak lays the Boonsung wreck. Sunk in 1984, this old tin dredger that is 60 meters in length, 12 meters wide and 6 meters high, and lies positioned in a north to south direction on serene flat sand at 18 to 20 meters. The wreck is fully covered with barnacles and sponges. Nudibranches, spotted morays, white eyed morays, zebra morays and leopard morays, lionfish and scorpionfish find their house on the deck. Tones of fish gather around here, such as schools of barracuda’s batfish, travellies and snappers. On the sand floor, you can often see leopard sharks and tiny flounders and flatheads wedged in the sand.
During the whale shark season (February, March) there is a good change to encounter a whale shark.


With our Liveaboard adventures we visit the folowing dive locations:

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