Ko Tao is an island with an area of 21 km2 in the Gulf of Thailand part of Surat Thani Province. Restaurants, nightspots and dive shops cluster in Mae Haad Beach and near Sairee Beach. Villas dot palm-fringed beaches such as Chalok Baan Kao Bay, on the south coast. In the northwest, Koh Nang Yuan is a group of islets with hilltop views. Ko Tao is known for its tropical coral reefs, with species including whale sharks and rays. Hawksbill and green turtles gather here to breed.