Surin Islands
Overview
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.
Marine life
Dive profile
DEPTH PROFILE
DEPTH PROGRESSION & WAYPOINTS: Surin Islands
Location
Frequently asked questions
How do I get to the Surin Islands?
The Surin Islands are located 55 kilometers off the coast of Phang Nga Province. Access is by liveaboard boat departing from Khao Lak or Phuket, or by day trip speedboat from Kuraburi Pier during the open season from November to May. Most divers visit on liveaboard itineraries that combine the Surin Islands with Richelieu Rock and the Similan Islands over 4 to 6 day trips.
When is the Surin Islands national park open?
Mu Ko Surin National Park is open from approximately November 1 to May 15 each year. The park closes during the southwest monsoon season from May to October when seas are too rough for safe diving and boat access. The best diving conditions are typically from January to April with the calmest seas and clearest visibility.
What makes Surin Islands diving different from the Similans?
The Surin Islands generally offer shallower, more sheltered dive sites with exceptional hard coral coverage, making them more accessible to newer divers and snorkelers. The Similans tend to feature deeper granite boulder sites with stronger currents. The Surins also have a distinct cultural element as home to the Moken sea nomad community. Both destinations are often combined on liveaboard itineraries.
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Data Provenance
This profile is compiled from 3 operator submissions and 142 community logs. Key facts (depth, entry) are verified against official hydrographic charts.