The Gulf of Thailand, historically known as the Gulf of Siam, is a shallow inlet adjacent to the southwestern South China Sea, bounded between the southwestern shores of Mainland Southeast Asia and the northern half of the Malay Peninsula. The gulf's many coral reefs have made it attractive to divers visiting Thailand.
The highest concentration of deep technical dive sites is in the Samae San Island area. It offers a range of the deepest technical dives in the Gulf of Thailand that are also easily accessible. A number of deep wreck dives are present in the Gulf of Thailand however these require extended boat trips and extra safety and logistical considerations. Koh Tao offers two easily accessible tec diving sites however these have much shallower depth compared to other tec diving locations in the Gulf of Thailand
Name Max. depth Coordinates Location Type of Dive Samaesan HoleSamae San IslandOpen ocean Sharkfin Deep Drop / Samaesan Cliff Samae San IslandOpen ocean / Wall 1/4 Mile Mouthpiece Drop Samae San IslandOpen ocean east of Koh TaoWreck northeast of SongkhlaWreck Ko LosinWreck Thunder Bowl Samae San Island Open ocean HTMS Pangan No record northeast of Koh TaoWreck Narcosis Colosseum Samae San IslandOpen ocean Koh Rong Nang Training Buoy Samae San IslandReef HTMS Sarasin No recordPattayaWreck PAK 1/Koho Maru-5 Koh ChangWreck Chumphon Pinnacle Koh TaoReef Sail Rock/Hin Bai Koh TaoReef
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