The Similan Marine Park is located 70km west of Thailand Phang-Nga province. This group of islands is considered to be one of the top dive destinations in the world, mainly due to the clear water that surrounds the islands.

Similan was derived from the Malay work for nine “Sembilan” as the little archipelago is made up of nine islands. The islands do have local individual names, but are usually referred to by their respective numbers from North to South.

The Similan’s were designated as a National Park of Thailand in 1982 and cover an area of 128km2, which includes Koh Bon and the two rocky outcrops of Shark Fin Reef and Hin Pusa.

In 1998 an extra 12km2 of area was added when Koh Tachai was added to the park, which is now a total area of 140km2, of which only 15km2 is land.

Most of the islands are uninhabited with the exception of Islands 4, 8 and koh Tachai, which have national park offices located on them.

With the nine islands you get a wide variety of experiences, activities and stunning views, there are white sand beaches and massive boulder formations.

Underwater there are amazing coral gardens and diverse marine life ideal for all divers.

The topography differs between the eastern and western sides of the islands. The east side consists of sandy bottoms with wide and colourful soft and hard coral fields that slope down to 40m in some areas. They have gentle current and make for easy diving.

The west side is characterized by large, stacked granite boulder formations which create tunnels and archways with impressive scenery. Currents here can be unpredictable which can make the diving more challenging for beginner divers. But this side is exposed to the open sea and provides good opportunities to spot big pelagic life.

Island 1               Koh Hu-Yong

The second largest island lies 8km south of island 4, it has the largest white sand beach of the Similan National Park which is located on the north side of the island. The beach is a protected area and has a Turtle hatchery, you need special permission from the forestry department to enter this island.

Island 2 and 3     Koh Pa-Yang and Koh Pa-Yan

These two islands are also protected, their topography is granite boulders with mountains and cliffs, no beaches. At resent all the first 3 islands are closed to diving in an effort to preserve the underwater environment. The most southern dive sites are the rocky outcrop of Shark Fin Reef and the submerged site of Boulder City.

Island 4               Koh Miang

The island has a marine park office, camping, small bungalows and a fresh water supply. There are 2 beaches, Haad-Yai or Princess beach on the north and Haad-Lek or Honeymoon beach to the East. There is a trail that runs between the two through the forest. Also on the island is a view point where once you reach the top has a spectacular view of the south islands of the Similans, the trek to get there is a little energetic though.

Islands 4 and 5   Koh Ha and Koh Hok

These two islands are located to the East of Island 4 and are the smallest in the group. The landscape underwater is spectacular with both fringing reef and boulder formations.

Island 7               Koh Pa-Yu

The island has a combination of granite formations and sand beaches. The East side of the island is now closed to diving, but the north and west sides offer rocky pinnacles as dive sites which are covered in soft corals. Again these sites are open to the ocean so currents can be encountered along with the bigger pelagic life.

Hin Pusa

Is located between islands 7 and 8 and is a group of boulders known as “Elephant Head Rock” as the shape resembles the head of an elephant. The site is recommended for experienced divers due to the depth and current.

Island 8               Koh Similan

Is the highest and largest of the islands and has a marine park office and camping in the North of the island at Donald Duck Bay. It is also where the famous Sail Rock is located which is a symbol of Similan. The view from the Rock shows the North part of the Similans. There is no diving on the west or East side of the island, leaving only the North area available.

Island 9               Koh Ba-Ngu

The island has no beach, but is a favorite with divers due to the scenery underwater, it has a mix of coral reef and rocky outcrops.

Koh Bon

The island is North east of Similans, with no sand beaches it is a limestone island with an unusual “hole” which traverses the island on the west side caused by sea erosion. The most popular dive is the ridge where a cleaning station for Manta Rays can be found.

Koh Tachai

This is most Northern part of the Similan Marine Park.  The island has a beautiful white powder beach where the park office is located. With many dive sites including a plateau to the south it is a popular dive destination.

Richelieu Rock

Although not part of the Similan marine park this is often dived on the same liveaboard trips. It is actually part of the Surin Marine Park and is located between the mainland and Surin islands. It is a submerged pinnacle know for it colourful soft coral and rich diversity of life, which can include the smallest creatures such as ghost pipe fish and sea horses to the largest of whale sharks and Manta rays.