Ko Samui, or often simply Samui as it is referred to by locals, is an island off the east coast of the Kra Isthmus in Thailand. It is located close to the mainland town of Surat Thani in Surat Thani Province. It is part of the Samui Archipelago
Ko Pha Ngan is an island in the Gulf of Thailand in South East Thailand, and located in Surat Thani Province. It is part of the Samui Archipelago. It is famous for its full moon party at Haad Rin Beach and as a backpackers destination.