Tao Island is located on the east coast of Surat Thani Province ,45 kilomaters to the northwest of Pha Ngan Island.Its total surface area is 21 square kilometers or approximately 13000 rais. Frpm noth to sount it is 7.5 kilometers long and from east to west it is 4.5 kilometers wide.

Allmost all of the island is mountainous.There are two amall island nearly; Nang Yuan Island which measures about 202 rais whis has a sand bar which connects its three islands together,and Gong Sai Dang Islands (Shark Island),a tiny island to the northeast of Koh Tao which has a total area of just 6 rais

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The island is located at the shore to the gulf of thailand. Most notable are the solitary limestone hills, both on the land and in the sea as islands. Diving from all over the world travel to koh tao Beach to diving. Koh Tao is perhaps the most famous.