Chumphon Pinnacle (Koh Tao)

A deep granite seamount northwest of Koh Tao, Chumphon Pinnacle features a summit around 14 meters and sand at 30–36 meters. It is a classic spring magnet for whale sharks and bull-size schools of trevally, with seasonal thermoclines that can drop temperatures a few degrees. Currents vary from mild to brisk and can split, so briefings and compass awareness matter. Advanced Open Water and Deep or recent experience to 30 meters are strongly advised, and Nitrox extends time at the mid-20s. Maintain buoyancy above the anemone fields and keep your head on a swivel, as many shark passes happen just off the pinnacle in the blue.