Appropriately named for it's resemblance to a sharks dorsal fin, this is one of Koh Tao's treasures. Each side of the island is its own dive site, with one side packed with a huge variety of hard corals and sponges, making this a popular home for turtles. The other side boasts a breathtaking soft coral garden with frequent sightings of stingrays, moray eels and titan triggerfish. Currents at this site can be stronger than usual for this area which makes this the perfect opportunity for a drift dive.