Tachai Island, also called Virgin Island, is situated between Similan and Surin National Marine Parks, 135 km north-west of Phuket and 70 km west of Khao Lak. It is considered to be one of the best diving and snorkeling sites in Thailand. It has beautiful corals with many large fish. There are leopard sharks, nurse sharks and eagle rays. Hawksbill turtle and whale sharks are regular visitors of these water. It is a lovely island with a long white beach, beautiful waters, rocky outcrops and a small mountain viewpoint. It is also home to the peculiar chicken crabs.