Chumphon Pinnacle

Image credit: Wikimedia Commons

Overview

Chumphon Pinnacle is widely regarded as one of the most significant and popular dive sites accessible from Koh Tao. Located approximately 11 kilometers (about 40 minutes by boat) northwest of the island in the open Gulf of Thailand, the site is defined by a massive, submerged granite monolith. The main pinnacle is surrounded by a series of smaller rock formations, collectively creating a substantial underwater structure that rises from a sandy seabed at 35 meters (115 feet) up to a crest roughly 14 meters (45 feet) below the surface.

Because the entire structure is completely submerged and located in open water, the site is fully exposed to ocean currents and surface conditions. Due to the depth profile—with the shallowest point resting at 14 meters—Chumphon Pinnacle is generally reserved for divers holding an advanced certification. It is not an appropriate location for those just beginning their open water course. However, for divers looking for the best places to learn deep diving protocols or complete their Advanced Open Water training, Chumphon provides an ideal, highly structured environment frequently utilized by local instructors.

The Dive Experience

Dives at Chumphon Pinnacle typically begin with a direct descent down a mooring line, allowing divers to bypass any surface currents and reach the shelter of the main pinnacle. The dive profile usually involves circling the massive granite structure, slowly spiraling upward as bottom time elapses.

Because of its offshore location, visibility at Chumphon is highly variable, ranging from 10 meters on a challenging day to over 25 meters when conditions are optimal. Currents are frequently moderate, requiring divers to seek shelter in the lee of the rocks. Water temperatures remain consistently warm, generally between 28°C and 30°C (82°F to 86°F). Divers should consult a travel and packing guide prior to arrival; a dive computer is absolutely essential for this site to accurately monitor nitrogen loading during the deep, multi-level profile.

What You’ll See

The sheer scale of Chumphon Pinnacle acts as a major aggregation point for marine life in the otherwise featureless open gulf. The granite rocks are heavily encrusted with pink and purple anemones, which host massive populations of pink anemonefish.

The primary draw of Chumphon, however, is the pelagic activity. The site is frequently swarmed by enormous, swirling schools of chevron barracuda and bigeye trevally, which hunt in the currents sweeping past the rock. Divers often encounter large Malabar groupers lurking in the deeper crevices near the base of the pinnacle, while curious longfin batfish frequently follow dive groups during their ascents.

Chumphon Pinnacle is also one of the most reliable locations in the region for encountering whale sharks (Rhincodon typus). While sightings are entirely dependent on seasonal plankton blooms and luck, these massive filter feeders are most commonly reported between March and May. If a whale shark is present, strict local interaction guidelines must be followed: divers are required to maintain a respectful distance, avoid flash photography, and never touch the animal.

Planning Your Dive

Due to its popularity and reputation, almost every dive center on Koh Tao runs scheduled trips to Chumphon Pinnacle several times a week. These trips are typically scheduled for early morning departures to capitalize on calmer surface conditions before the afternoon winds increase. As the site falls under the general jurisdiction of Thai maritime authorities and local conservation groups, all divers are expected to practice excellent buoyancy control to preserve the dense anemone fields covering the upper sections of the reef.