Considered the premier dive site in the Gulf of Thailand, Sail Rock is a pinnacle which rises to 15m above and 40m below the surface. Sail Rock lies between Koh Phangan and Koh tao. It's famous for its natural underwater vertical swim through or chimney which divers can enter at 6 metres and exit at 18. It is also the visiting site of many larger pelagic fish including chevron barracuda, big schools of mackerel, jacks, trevally and tuna. You may encounter a seasonal whale shark with over 40 spotted at Sail Rock in 2012 alone. Giant moray eels and lion fish have also taken up residency. The Trigger fish are also very playful during their nesting period!