Similan Islands is located on Phra Thong Island, covers an area of 80,000 hectares have been declared . National Park on September 1, 2525 , Similan as Jawi or Malay word for " nine " Koh Similan is a small group of islands in the Andaman Sea There are nine islands , from north to south. Similan Islands are regarded as the island is beautiful both on land and underwater. There are many kinds of beautiful coral Can dive both shallow and deep water. Can be found in fish such as whales , dolphins and rare fish, eels (moray) last month to see the most. Is from November to April. In addition to the island closed .