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Located in the Andaman Sea in southern Thailand, the beautiful Similan Islands are a group of nine islands, and lay claim to being one of the most famous dive destinations in the world.

To the north, the Surin Marine National Park consists of five granite islands covered in lush forest with idyllic beaches and beautifully clear water.

Immerse yourself in colourful reefs, lush corals, impressive sea fans and an incredible variety of marine life including large pelagics such as manta rays and whale sharks. Gigantic boulders, above and below the water line create awesome underwater scenery and exciting swim throughs.

Although some sites can be reached from resorts in Kao Lak, it is best to visit this region by liveaboard. A visit to Richelieu Rock is a must, most famous for sightings of whale sharks and manta rays. This submerged rock is surrounded by a series of underwater pinnacles covered in corals and sea fans and is incredibly rich in marine life, making this a spectacular wall dive.

View suggested itineraries

Key info

  • Ideal for viewing: whale shark, giant oceanic manta ray, leopard shark, green turtle, hawksbill turtle

Dive trips

This dive location is featured in the following itineraries:

West Coast Explorer

This itinerary allows you to explore the most famous dive sites of Thailand, both from the convenience of a liveaboard in the Similan Islands, and the comfort of a dive resort, where you can relax in tropical surroundings.

  • When to go: Nov-Apr
  • Duration inc. flights: 13 days
  • Price inc. flights: From £2,045 pp
  • Trip type: Tailor-made trip idea

Phuket & Khao Lak Diving

Here are some of Thailand’s most outstanding dive sites, with excellent opportunities to spot leopard sharks amidst a kaleidoscope of marine life, with manta rays often gracing divers with their presence.

  • When to go: Nov-May
  • Duration inc. flights: 13 days
  • Price inc. flights: From £1,595 pp
  • Trip type: Tailor-made trip idea
Suggested liveaboards are shown below. Please contact us for further recommendations.

Genesis I

A perfect introduction to liveaboard diving, the Genesis I makes three night trips to Thailand's Similan & Surin Islands from Nov to May. Enjoy unlimited diving from a sea level platform, with dinghy pick up,

Marco Polo

The friendly Marco Polo operates six night adventures to Thailand's Similan Islands, including Koh Bon, Koh Tachai and the famous Richelieu Rock, renowned for sightings of whale sharks and manta rays.

Thailand Aggressor

The luxurious Thailand Aggressor sails the Andaman Sea throughout the year, visiting famous dive sites such as the Similan Islands, Richelieu Rock and Phi Phi Islands off the west coast of Thailand.