Koh Ngam Noi / Vietnamese Island

Koh Ngam Noi, also known as Vietnamese Island, is an advanced dive site near Chumphon in the Gulf of Thailand, a small island whose surrounding waters present challenging conditions despite the relatively moderate sixteen-meter maximum depth. The advanced rating reflects the strong currents that sweep around this exposed island, creating dynamic diving conditions that reward experienced divers with impressive marine activity. The island's position in the current path means marine growth is vigorous and fish activity notably higher than at sheltered sites. Coral coverage on the rocky substrate is healthy, with hard and soft corals thriving in the nutrient-rich flow. The constant water movement creates conditions favored by filter-feeding organisms, and the overall reef productivity is impressive. Fish life concentrates around the island in response to the current's bounty. Schools of barracuda, trevally, and snappers are common, while the rocky substrate shelters groupers and moray eels. The current brings the possibility of pelagic visitors, adding excitement to every dive. The combination of current exposure and moderate depth creates an experience where the main challenge is managing position rather than depth. Koh Ngam Noi provides experienced divers with genuinely exciting current diving in the Chumphon area. The dynamic conditions and resulting marine activity make it one of the most rewarding advanced options available in this section of the Gulf of Thailand.