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 Shark Fin Reef will offer diver two different sceneries. The northeast which features a sloping reef and the southeast which is a more dramatic drop-off. A series of parallel rocks resembling fallen logs are the setting for this Similan diving site.

To the southeast is a large swim-through that provides an opening to the other side of this dive site. The marine life here is diverse with clown triggerfish, half-moon triggerfish and schools of batfish, palette surgeonfish, blue-faced angelfish and banner fish. It's also a good place to spot passing sharks and larger rays.

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

Boulder city is a submerged site about one kilometre off the east coast of island number 3 and about 400 m south east of Shark Fin Reef. Due to its exposed location, divers will have the opportunity to see almost anything on this Similan dive including whale sharks and manta rays.

There is very little coral growth here except for green branching cup corals and orange sea fans, but the algae growth here is substantial, meaning a prolific amount of nudibranchs, including the twin magnificent sea slug and Spanish dancers. Leopard sharks are frequently seen as well as white-tip and black-tip reef sharks.

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

The Thai name for this spectacular rock is “Hin Muan Deaw” and is the best way to describe how beautiful this rock really is, as it directly translates to “Whole roll (of film) rock”, as one can use an entire roll film solely on this rock. Shallow coral gardens comprise huge pore and staghorn corals with small pinnacles. A big outcrop located on the southeast makes this dive site unique and attracts many photographers. Colorful soft corals, gigantic sea fans, and many species of hard corals surround this fantastic rock.

• Dive Type: Boat Dive
• Diver Level: Open Water Diver
• Max Depth: 18

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

Honeymoon Bay leads off from Haad Lek (small beach) on Island Four. This reef is great for snorkelers and we often use it for the first swim of our 5 day cruise. Typically we’ll hitch a ride on our dedicated taxi (the dinghy) from Anita’s Reef and drop into the water just off the beach. As you swim south from the beach the sandy bottom develops into swathes of staghorn coral.

Pore corals fill-in the open patches along with larger rock formations. Visibility is usually very good here, so you have the opportunity of swimming as swallow or as deep as you like. The gentle sloping reef ensures everyone can stay within their comfort limits as they familiarize themselves with the water and their equipment.

A great place to find many of the smaller reef fish varieties, including everyone’s favourite ‘Nemo’ the Clownfish and his cousins. Moray, octopus, crocodile needle fish and the beautiful angelfish are all common here, and there is even a chance of a turtle every now and then. Honeymoon Bay leads off from Haad Lek (small beach) on Island Four. This reef is great for snorkelers and we often use it for the first swim of our 5 day cruise. Typically we’ll hitch a ride on our dedicated taxi (the dinghy) from Anita’s Reef and drop into the water just off the beach. As you swim south from the beach the sandy bottom develops into swathes of staghorn coral.

Pore corals fill-in the open patches along with larger rock formations. Visibility is usually very good here, so you have the opportunity of swimming as swallow or as deep as you like. The gentle sloping reef ensures everyone can stay within their comfort limits as they familiarize themselves with the water and their equipment.

A great place to find many of the smaller reef fish varieties, including everyone’s favourite ‘Nemo’ the Clownfish and his cousins. Moray, octopus, crocodile needle fish and the beautiful angelfish are all common here, and there is even a chance of a turtle every now and then.

• Dive Type:
• Diver Level: Open Water Diver
• Max Depth: 26m