Chumphon Pinnacle
Depth is the range from the top of the site to its usual maximum; "recommended cert" is the mainstream-agency level operators usually ask for, not a legal rule. Currents and visibility change daily — treat everything here as planning ranges.
Chumphon is Koh Tao's serious dive, the one instructors save for the last day of an Advanced course. A granite tower rises from the gulf floor to 14 m, its entire crown carpeted in magnificent sea anemones that ripple like a single organism, pink skunk clownfish seething across it. Around and above, the water column belongs to schools: big-eye trevally in torrents, chevron barracuda in drifting palisades, queenfish flashing through. Whale sharks appear regularly enough in season that half the island drops everything when the call goes out. The resident bull sharks that once patrolled here faded from sightings in the mid-2010s; the pinnacle never needed them to fill a logbook page.
The moment you come for: Anemone-carpeted summit, torrents of trevally and barracuda, the island's best whale-shark odds
Topography: Granite pinnacle crowned in anemones, satellite rocks on sand at 36 m
Current: Open-gulf site with honest current some days; descents and ascents use the lines.
Entry: About 30-45 minutes northwest of the island; buoy lines run to the pinnacle top at around 14 m.
Know before you splash
Hazards: Depth for newer divers, current on exchange days, and crowds on the lines at peak hours.
Conservation: Multiple schools converge here daily; line courtesy and controlled ascents keep the column safe for everyone.
Nitrox: Worth it here — profiles sit in the range where enriched air meaningfully extends no-stop time (with the training to use it).
Who you'll meet
Clownfish & Anemonefish
Giant Trevally
Great Barracuda
Porcupinefish
Whale Shark
For photographers
Wide angle: ★★★★★ · Macro: ★★☆☆☆ — editors' 1–5 rating of what this site gives each style of shooting