North Surin Island (Ko Surin Nuea) is one of the two main islands of Mu Ko Surin National Park, located in the Andaman Sea approximately 60–70 km off the coast of Phang Nga Province, Thailand, and separated from South Surin by a narrow, shallow channel. The island serves as the administrative and visitor hub of the national park. It is known for clear waters, healthy coral reefs, and abundant reef fish, making it suitable for freediving and snorkeling. Notable marine features include shallow fringing reefs near the beaches that slope into deeper reef systems, with frequent sightings of reef fish and occasional sea turtles
On land, North Surin hosts Mai Ngam Beach, designated camping areas, bungalow accommodation, and short hiking trails within the island’s interior. Visitors can contact Mu Ko Surin National Park authorities or licensed boat operators for permits, accommodation arrangements, and guided activities.
Rules for free divers are stricter than other dive sites in Thailand. For example, only dive spots with "blue" buoy are permitted for free diving and this is subjected to the national park 's calendar year rule. Some dive spots requires ONLY short fins. More rules below.
Visibility: 5–30 m; best during dry season (December–April)
Depth Range: approximately 5 m to >30 m at reef slopes and nearby sites
Water Temperature: typically 26–31 °C in dry season, rarely below 27 °C
Water Conditions: generally calm in peak season with possible currents at some sites
Seasonality: Mu Ko Surin National Park open roughly mid-October/November to mid-May; best conditions December–April
Transportation: speedboat or tour boat from Khura Buri or Khao Lak, approx. 60–70 km crossing
Local rules: National park regulations apply. Local free dive instructor is MUST. Free dive training are prohibited.
