Ko Pha Ngan is an island in the Gul

Ko Pha Ngan is an island in the Gulf of Thailand in South East Thailand, and located in Surat Thani Province. It is famous for its full moon party at Haad Rin Beach and as a backpackers destination. Ko Pha Ngan has two sister islands: the larger Ko Samui to the south and the smaller Ko Tao to the north.
The name of Ko Pha Ngan comes from the word 'Ngan', meaning 'sand bar' in the southern dialect, for there are many sand bars offshore around the island.
Ko Pha Ngan has been a longtime favorite of past kings of Thailand. Specifically Rama V, or Chulalongkorn visited Ko Pha Ngan 14 times during his reign. The Bronze Drum of Dongson Culture (500–100BC) that was found on Ko Samui in 1977 is evidence that there were settlements of people on Ko Samui, Ko Pha Ngan, and their islets from more than two thousand years ago. Some historians and archaeologists believe that the first group who migrated to Ko Pha Ngan were the Muslim sea Gypsies (Pygmy, Semung, and Proto-Malay) who travelled by boat from the Malay Peninsula. However, nowadays there are few Muslims who live on the island.