A group of 9 small islands 50 kms. off the west coast of Phang-Nga down to the Andaman Sea. The National Park covers an area of 80,000 rai. The islands are undeveloped and unspoiled: numerous species of fish, crustaceans, and other forms of sea-life abound : crystal clear water and diving are excellent. Similan is corrupted from the Malay Sembilan and means nine.From north to south in order the islandsKoh Bon, Koh Ba Ngu, Koh Similan, Koh Pahyoo, Koh Miang (two islands),Koh Pahyan, Koh Payahng and Koh Hu Yong.