Sail Rock & Southwest Pinnacle

Sail Rock, known locally as Hin Bai, rises from the Gulf of Thailand between Koh Tao and Koh Phangan and is widely regarded as the Gulf's premier dive site. A dramatic chimney runs through the rock allowing divers to ascend through a column of glassfish, while the surrounding walls are draped with seafans and patrolled by whale sharks from February through May. Southwest Pinnacle, a cluster of submerged peaks southwest of Koh Tao, draws schooling barracuda, trevally, and frequent whale shark sightings in the same season.