Ko Tao is an island in Thailand and is part of the Chumphon Archipelago on the western shore of the Gulf of Thailand. It covers an area of about 21 km2. Administratively it is a subdistrict of Ko Pha-ngan District of Surat Thani Province. As of 2006 its official population was 1,382. The main settlement is Ban Mae Haad.
The economy of the island is almost exclusively centered on tourism, especially scuba diving. Scuba diving is extremely popular in Ko Tao due to clear visibility, inexpensive pricing and the range of sealife to be seen.
Wikipedia https://en.wikipedia.org/wiki/Ko_Tao
Coordinates 10°5'37.5" N 99°50'4.766" E