Surin Islands

Khao Lak · Phang Nga · Thailand

The Surin Islands form one of Thailand's most pristine marine environments, an archipelago of five islands within Mu Ko Surin National Park situated 55 kilometers off the coast of Phang Nga Province in the Andaman Sea. These remote islands support some of the healthiest coral reefs in Thai waters, benefiting from their distance offshore, national park protections, and the nutrient-rich currents that flow through the area from the Indian Ocean. The underwater landscape around the Surin Islands is characterized by granite boulders interspersed with expansive coral gardens. The hard coral coverage is exceptional, with massive Porites bommies, intricate staghorn thickets, and table corals reaching impressive sizes. The reefs extend from just below the surface to depths of 20 to 30 meters, creating multilayered habitats that support extraordinary biodiversity. The water clarity frequently exceeds 25 meters, bathing the reefs in natural light that reveals every detail of the coral formations. Dive sites around the islands offer diverse experiences. The sheltered bays of Ko Surin Nuea and Ko Surin Tai feature gently sloping reefs perfect for newer divers and snorkelers, where clouds of butterflyfish, angelfish, and parrotfish feed among pristine coral gardens. The channels between the islands experience mild currents that bring larger visitors including hawksbill turtles, blacktip reef sharks, and schools of batfish and barracuda. The granite boulder sites on the outer edges offer more dramatic topography with swim-throughs and overhangs. The Surin Islands serve as a gateway to some of Thailand's most celebrated dive sites. Liveaboard itineraries typically combine the Surins with nearby Richelieu Rock, widely considered Thailand's finest single dive site, and the Koh Bon and Koh Tachai areas where manta ray encounters are a highlight from February through April. This combination of easily accessible reef diving and world-class pelagic encounters makes the Surin route one of the most popular liveaboard circuits in Southeast Asia. Beyond diving, the Surin Islands hold cultural significance as home to the Moken, a sea nomad community whose traditional knowledge of the marine environment spans generations. The islands' healthy reefs, clear waters, and diverse marine life make them an outstanding destination for divers, snorkelers, and marine enthusiasts seeking Thailand's underwater heritage at its finest.