Phuket Island has some decent dive sites and the largest diving center in Thailand. The reefs around the area are in a healthy condition with both solid and colorfully soft corals. There is also an abundance of marine life. Most of the dive locations are suitable for all levels of divers but there are also some that are quite deep.

The most well-known dive site in the Phuket area is Racha Yai with its sloping rocky reefs and its plentitude of solid coral forests. There is also Ter Bay where there is an exciting wreck in the depths of 25-35 meters. The area south Racha Yai, Racha Noi, is a haven for experienced divers as the depths are greater and the currents stronger.

The overall topography is strikingly different from Racha Yai with huge granite boulders and the chance to see Manta Rays and Whale Sharks. The diving in Racha Noi compared to Racha Yai is definitely more challenging but the rewards are far greater.

Just off Phuket, is the limestone island of Koh Doc Mai which soars vertically from the sea-bed. It is home to a diversity of fish and offers the opportunity to view leopard sharks, moray eels, octopus and turtles.