Koh Tao is an island in the Gulf of Thailand, located about 55 km east of Chumphon and about 15 km north of Koh Phangan. The island is about 21 km long and about 10 km wide. The island is mountainous with many steep cliffs. There are several beaches, both on the east and west coasts of the island.
Koh Tao is a popular destination for divers and snorkelers. The island has over 30 dive sites, many of which are located close to the island. The best time to dive is from November to April.