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.
Koh Tachai is an island close to the world famous Similan Islands. It is an idyllic location in the Andaman Sea with white sandy beaches and azure crystal clear water. The island is located 40km due west from Koh Phra Thong. It is about 570 km south of Bangkok and 130 km north of Phuket.
Koh Tachai is unique in Thai waters in that it holds equal appeal for both divers and snorkelers. Scuba divers have the opportunity to observe sharks/mantas off Koh Tachai's pinnacle whilst snorkelers enjoy the calm shallow bay. The beaches at Koh Tachai are spectacular with the white sand and clear water. For these reasons it is often referred to as the Maldives of Thailand