Around 11km to the northwest of Koh Tao this is one of the better dive sites in the area. It has one large main pinnacle with several more smaller ones surrounding it, rising from depths of around 35 to 15 meters. Here you will find large underwater plateaus rich in branch corals and an exceptional presence of reef inhabitants and pelagic visitors. This is the place where you are most likely to spot the seasonally visiting whale sharks and the occasional manta ray.

Depth: 14 - 35m
Viz: 5 - 25m
Currents: Can be strong
Getting there: Boat 45 mins
Best months: April/May

This site offers several small caves and crevices that you can swim through and where marine life can be seen sheltering. The boulders range in depth from 5 metres down to around 32. There is often a strong current here that you can use to drift around the submerged pinnacles so its not really recommended for inexperienced divers. You are guaranteed to see Yellow Margin and Titan Trigger fish here as it is a popular breeding ground for them.

Depth: 5-30m
Viz: 5 - 25m
Currents: Can be strong
Getting there: Boat 15 mins
Best months: April/May

Named after the ornate arrangement of coral boulders japanese Garden is located on the east side of Koh Nang Yuan, with depths ranging from 2 to 12 meters it is suitable for snorkelers & beginners. A drift dive can be done from Red Rock ( above) through a series of swimthroughs and emerging into Japanese Gardens for a relaxing stop amongst the myriad coral formations.

Depth: 2 - 14m
Viz: 5 - 15m
Currents: None
Getting there : Boat 10 mins
Best months: April/May

Depth: 2 - 20m
Viz: 5 - 25m
Currents: Occasional
Getting there : Boat 5 mins
Best months: April/May

The Unicorn is supposed to have been sunk in 1989 as an insurance scam. The 60 metre long cargo vessel was reported to have a hold full of expensive tuna fish which turned out to be cheap dog food, hence it's nickname - the "dog food" wreck. This site is about 12km off Mango Bay and in 50 metres of water it is also a technical dive. Still mostly intact with the majority of the obtrusive fishing nets now removed some penetration is possible. The wreck is now home to some big red snappers and patrolling groupers. The wreck is located around 20-25 minutes due north of Koh Tao travelling at 10 knots.

Depth: 38 - 50m
Viz: 5 - 15m
Currents: Can be strong
Getting there : Boat 30 mins
Best months: April/May

Situated on the east side of Koh Tao is Hin Wong Pinnacle. This site comprises several large granite boulders covered with sea fans and whip corals, as well as filefish, shrimpfish, coral grouper and many other reef fish. You may encounter the resident Green Turtle if you're lucky. The summit is a tabletop rock formation within about 10 metres of the surface and the maximum depth at Hin Wong is around 32 metres.

Depth: 10 - 32m
Viz: 5 - 20m
Currents: Occasional
Getting there : Boat 5 mins
Best months: April/May

Shark Island is a twin rock outcrop named after its resemblance to a dorsal fin situated to the southeast of Koh Tao. Each side of the islet offers a different variety of marine life making seem like two sites in one. On the east side you'll find myriad soft corals, gorgonians and sponges while the west offers hard coral formations that are home to moray eels, nudibranchs, sting rays and the occasional Leopard shark the maximum depth here is 25 metres.

Depth: 0 - 25m
Viz: 5 - 25m
Currents: Can be strong
Getting there : Boat 20 mins
Best months: April/May

Considered the premier dive site in the Gulf of Thailand, Sail Rock is a 15m above and 35m below surface pinnacle that lies between Koh Tao and Koh Pha-ngan. Its famous for its natural underwater vertical swimthrough or chimney which divers can enter at 6 metres and exit at 18. It is also the visiting site of many larger pelagics including chevron barracuda, big schools of mackerel, jacks, trevally and tuna. You may encounter a seasonal whale shark or manta ray here aswell.

Depth: 0 - 35m
Viz: 10 - 30m
Currents: Can be strong
Getting there : Boat 60 mins
Best months: April/May