The Similan Islands (meaning "nine islands") is a Marine National Park 60 nautical miles north west of Phuket. There are nine islands running from south to north that are numbered accordingly. The park has the reputation as one of the best diving destinations in the world. The Islands are granite boulder formations, densely covered with tropical vegetation. Also the floor of the sea consists of large granite boulders over grown with corals and algae that lie strewn together all the way from the surface to a depth of 40 meters below. This provides the diver many interesting swim-through, canyons, archways and caves.

The Similan Islands also have a rich variety and abundance of reef fish. There are deep water creatures like manta rays and whale sharks who visit the area regularly. The Surin islands, which are also included in Thailand 's national park system, consist of two main densely forested islands and are home to a number of Sea Gypsies or Chao Lays, as well as a wide variety of fauna. Nearby Surin islands, the world famous 'Richelieu Rock', which lies only 10 miles away to the south east. Richelieu Rock is a horseshoe shaped pinnacle of rock rising from the sandy bottom at 35 metres to just break the surface at low tide. Constantly bathed in nutrient-rich water, 'Richelieu Rock' supports an incredible diversity of marine life from cuttlefish to cobias, mantas to whalesharks. This is a perfect divesite for repetitive multi-level diving to extend your underwater time to experience its wonders.

Hing Muang
Hin Muang, Hin Daeng are located about 80 kms, South East from Phuket. They are one of the best dive spots in Thailand (truly a world-class dive site). The 2 rocks with vertical walls dropping straight down to 50-60m are completely covered with hard and soft coral, sea fans, sea anemones and attract large school of jacks as well as fusiliers, tuna and barracuda. Hin Muang or Purple Rock, is named after the colorful sea anemones which cover the highest point of the reef. The reef starts at 9 meters below the surface and drops down to more than 70 meters with steep walls on both sides, whale sharks often encountered without a doubt one of the best dive sites in Phuket liveaboard Thailand.

Hin Daeng
Hin Daeng is a reef which consists of three small rocks visible at the surface and then plunging down to a depth of over 50 meters. With a 50 meter drop off on the south side and a relatively gentle slope on the north side. Hin Daeng is a dramatic dive site. Hin Daeng is also perhaps the only place in Thailand where Grey reef sharks can be seen in schools of up to 15 sharks. The richness and variety of pelagic fish compares to that found at Richelieu Rock, particularly for the sight of whale shark.