Ko Tarutao is the largest of the 51 islands in the Tarutao National Marine Park archipelago in the Southern Andaman Coast of Southern Thailand, in Satun Province. Ko Taratao lies approximately 30 km west off the coastal city of Satun. The island is 26.5 km long and 11 km wide.
The name Tarutao comes from the Malay words "Pulau Tertua" (the island of old). In the early 1940s Ko Tarutao was used as a prison because it was remote and hard to escape from. The 5th season of the television show Survivor was filmed on Ko Tarutao.