The Koh Surin is located in the Andaman Sea and covers an area of approximately 135 square km. From completely submerged pinnacles to fringing reefs, any variation can be found on this dive site. The Surin islands offer the most abundant coral spectrum in all of Thailand and divers can encounter eagle rays, turtles, and larger pelagics are possible here.

• Dive Type: Boat Dive
• Diver Level: Advanced Open Water Diver
• Max Depth: 30m

Richelieu Rock is one of the best places in the world to dive with whale sharks and is easily the best site in Thailand diving for this amazing activity. Here divers will encounter the largest fish in the ocean which are rare almost everywhere in the world. With nothing else for miles around, the whale sharks are attracted to the rock to feed on the rich plank tonic blooms that occur here.

• Dive Type: Boat Dive
• Diver Level: Novice Diver - 20 + Dives
• Max Depth: 40m

Koh Tachai is located in Tachai Island and lies about halfway between the Surin and Similan Islands and is rated as one of the best sites for Thailand scuba liveaboards as it's normally visited on the way to Richelieu Rock from the Similans. There are several dive sites around the island but the most famous is Koh Tachai Plateau which lies southeast of the island, about one kilometre offshore. The plateau is a submerged crowned reef of hard sheet corals, and scattered boulders. These boulders provide great swim-throughs and cut-through opportunities.

• Dive Type: Boat Dive
• Diver Level: Advanced Open Water Diver
• Max Depth: 35m

This dive site is one of the best places in Thailand to see manta rays, especially from April to May.
Koh Bon Island lies an hour or so north of the Similan Islands. It has a 33 metre wall on its south side, facing a small cove, with a stepped edge pointing west and down to over 40m.

Here divers will have the opportunity to see leopard sharks, white tip sharks; soft corals the colours of turquoise, yellow and green dominate. If you listen carefully you'll hear the warning clicks of hundreds of nervous damselfish, and the coral crunching of hungry titan triggerfish.

• Dive Type: Boat Dive
• Diver Level: Novice Diver - 20 + Dives
• Max Depth: 40m

The Boonsung Wreck is often described as ‘Fish Soup’. The density of marine life here is often better than most dive sites in the Similan Islands. An old tin mining vessel, surrounded by sand for miles in every direction, provides the perfect protection for thousands of juvenile fish. The schools of fish are huge and the variety of Macro life is one of the best in Thailand. This is a real divers dive site and part of a fascinating history of Tin mining in the Phuket and Khao Lak area.

The Boonsung Wreck is located about 5km West of Bangsak beach, to the North of Khao Lak. Visibility is typically not as good as the Similan islands. However, the huge variety of marine life makes it well worth seeing. It is a regular final stop on many Similan Liveaboards, although it is technically not part of the Similan islands. The Boonsung wreck also makes for an excellent and speedy day trip by longtail. The Boonsung Wreck is the best value dive around Khao Lak.

• Dive Type: Boat Dive
• Diver Level: Open Water Diver
• Max Depth: 19m