Sail Rock (Hin Bai)
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Maximum Depth: 33m (110ft)
A pinnacle that sticks some 7-9m out of the water, half way between Koh Tao and Koh Pha Ngan. A superb site offering a whole range of depths and diving areas and includes the famous chimney that is a vertical shaft that rises from 18m to 5m with another exit at 10m.
To the South East of the site is another smaller pinnacle that drops down to well past 30m and is often the place where you'll find plenty of Horse-eyed Jacks and Barracuda.