Map of Similan Islands
Map of the Similan Islands National Park, Thailand
Mu Koh Similian National Park is an area of 50km² off the west coast of Phang-nga in the Andaman Sea, A group of nine small islands. Because of the great natural beauty found on the islands and because of the extensive surrounding coral gardens beneath the waves it is considered one of the best diving sites in the world.
The islands are undeveloped and unspoiled, with a numerous species of fish, crustaceans and other forms of sea-life abound. Water clarity and diving are excellent here. The word “Similan” comes for the Malay term “Sembilan”, which means nine.
From north to south in order the islands are : Ko Bon, Ko Ba Ngu, Ko Similan, Ko Pahyoo, Ko Miang (two islands), Ko Pahyan, Ko Payahng and Ko Hu Yong.
The Similan National Park offers two different kinds of diving. Along the eastern side diving consists of gently sloping coral reefs with sandy patches and the occasional boulder in between.
West side diving is known for its huge underwater granite boulders with numerous swim throughs. The most famous east side dive site is probably East of Eden, off Island number 7. Elephant head rock is arguably the most famous west side dive site with a maze of swim throughs and the reputation for spin-cycle like currents running in every direction.
The scuba and snorkeling in this part of Thailand are world famous and you can easily spend a day or a week or even more enjoying yourself in the warm waters of the Andaman Sea. Most charters leave out of Tap Lamu north of Phuket and south of Khao Lak. If you are staying in Khao Lak you are quite a bit closer to the scuba piers, so you save a lot of road time getting there.
Wiki of Similan Islands