White Rock

White Rock is built from two granite pinnacles running north to south, joined by a coral garden and a sandy patch. The southern pinnacle drops to the site's deepest point and holds its larger fish life; most dives start here and work north, shallowing out through the coral garden around nine metres before finishing near the northern pinnacle, whose tip breaks the surface under two metres of water. Granite boulders, hard and soft coral, and patches of sand and shale make up the bottom, and rocky crevices and gaps run through the formation, including a small cave.

The site is large enough that Koh Tao dive professionals use it as a Divemaster mapping exercise, and even trainees who know it well call it one of the harder layouts on the island to draw. Divers who dive it often skip a straight line. They follow the low ring that circles the whole formation, using it as a standing compass-navigation exercise.

White Rock's reputation rests on what happens after dark. Hunting barracuda, cuttlefish and pufferfish come out under torchlight, and turtles, triggerfish and other reef residents are found sleeping wedged into the rock. Divers who have worked on Koh Tao for years single out its night dives as the strongest reason to come back, watching barracuda and grouper feed in the beam of a torch.

By day the case is scale. White Rock is named among Koh Tao's largest dive sites, granite pinnacles on a north-south axis generous enough that repeat visits keep turning up new corners even for divers who already know it. Its central, sheltered position on the island's west coast also keeps it calm enough to dive in most weather, which makes it a reliable stand-in when conditions elsewhere on Koh Tao turn rough.

Anyone diving White Rock without a guide who knows the ring route can lose their bearings quickly, simply because of the site's size. Stick close on a first visit, and use the ring itself as your reference line if you get turned around mid-dive.

A torch is standard kit for the night dives that are the site's main reason to book it. Titan triggerfish nesting near the reef can turn defensive in breeding season; give a guarding fish room and back off if it becomes agitated. Banded sea kraits hunt the crevices for eels and are consistently described as docile toward divers, including at close range, but they are venomous sea snakes and are left alone, not handled.

No permit or park fee applies to diving here, and the site sits outside any marine protected area.