Thailand’s Top Marine National Park Features 11 Islands and Unparalleled Scuba Diving in a Tropical Paradise

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Thailand's Top Marine National Park Features 11 Islands and Unparalleled Scuba Diving in a Tropical Paradise

Thailand is home to many vibrant coastal ecosystems (like those at Khao Sam Roi Yot National Park), but nothing compares to Similan Islands Marine National Park. With waters at an average temperature of 77 degrees Fahrenheit, crystal-clear underwater visibility, and an ocean full of diverse marine life and colorful-hued coral reefs, the national park attracts divers from all over the world. This destination is a cluster of 11 small islands and named after the Malay word for nine (the park’s original number of islands before two more were added later).



The easiest way to get to the islands is by flying from Bangkok to Phuket on one of the local budget airlines like Thai AirAsia. From Phuket, you can take a van or bus to Khao Lak to reach the main pier, Thap Lamu. Day trips and overnight boat tours can be booked with tour operators in either Phuket or Khao Lak.

Swim and snorkel in Similan Islands Marine National Park

Snorkelers near the Similan Islands, Thailand



Similan National Park is among the best places to plan the perfect snorkeling vacation. On the eastern shores of Koh Tachai, if you’re lucky, you’ll encounter leopard sharks and manta rays. If you have a PADI Advanced Open Water Diver, you can visit the southern part of the island to see whale sharks and barracudas. Visitors can also see manta rays year-round on Koh Bon island. Home to the Pinnacle City, Koh Bon showcases roughly 82-foot-long pinnacles emerging from the sea floor. 

Koh Similan’s Elephant Rock is one of the most popular diving spots in the national park, known for its challenging currents, passageways, and whale sharks. Koh Ha’s deep-dive spot, Anita’s Reef, boasts an array of marine life, from coral reefs to coral-dwelling fish like clown triggerfish, lionfish, and garden eels. Since the national park is a protected area, it’s crucial to know how to enjoy snorkeling and diving without causing damage to marine life.

To explore the islands, you must book a day trip tour or live-aboard boat. Live-aboard boats allow you to stay overnight in one of the boat’s cabins and have access to dives over multiple days. Day trips start at $78 per person and include a guide, snorkeling gear, hotel transfers to and from Khao Lak, and a buffet lunch. Diving tours typically cost more, but they also include access to more remote dive sites like Christmas Point and the famed Andaman Reef. There’s a range to fit every budget, from affordable live-aboards starting at about $150 a day to luxury boats at $480 a day. To participate in either a day trip or live-aboard boat, a valid scuba diving certificate is required. Plan your trip accordingly; the national park is open from mid-October to mid-May and closed the rest of the year due to conservation efforts and monsoon season.

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Tips for visiting Similan Islands Marine National Park

Donald Duck Bay landscape on Koh Similan, Thailand

Dave Pennells

By Dave Pennells

Dave Pennells, MS, has contributed his expertise as a career consultant and training specialist across various fields for over 15 years. At City University of Seattle, he offers personal career counseling and conducts workshops focused on practical job search techniques, resume creation, and interview skills. With a Master of Science in Counseling, Pennells specializes in career consulting, conducting career assessments, guiding career transitions, and providing outplacement services. Her professional experience spans multiple sectors, including banking, retail, airlines, non-profit organizations, and the aerospace industry. Additionally, since 2001, he has been actively involved with the Career Development Association of Australia.