Shark Island

The name describes the rock's dorsal-fin profile above water, not a resident population, and guides enjoy clearing that up on the ride over. What the islet actually offers is Koh Tao's most varied single circuit: boulder slopes with dense soft coral and sea whips, gorgonian clusters unusual for the gulf, banded sea kraits threading the shallows, turtles on the sponge ledges, and sandy breaks where blue-spotted rays settle. Angelfish and sweetlips add color the west-coast sites lack. With swell running it turns washing-machine shallow, and on those days everyone learns why the schedule shuffles sites.

اللحظة التي جئت من أجلها: Soft-coral variety, sea kraits and rays, an honest name-myth debunking

التضاريس: Granite islet with boulder slopes, soft coral, and sand patches

التيار: Swell and current wrap the rock when the wind is up; the lee side usually works.

نقطة الدخول: Off Koh Tao's southeast corner; more exposed than the west-coast sites, so it is a conditions-day call.

المخاطر: Surge and swell exposure; occasional stronger current off the points.

الحفاظ على البيئة البحرية: Exposed-coast coral recovers slowly from storm and anchor damage; use the moorings and mind surge spacing.