Koh Tachai is a famous island found in Similan Islands, Thailand, where it beholds a white sandy beaches and azure crystal clear water. It is located 40km due west from Koh Phra Thong, 570 km south of Bangkok and 130 km north of Phuket.

Koh Tachai is unique in Thai waters which is appealing for both divers and snorkelers. Scuba divers have the best experience to observe sharks and manta rays while snorkelers enjoy the calm shallow bay. Blue Guru Diving is the closest PADI dive center to this scuba diving mecca.

The beaches at Koh Tachai is also considered as the Maldives of Thailand because of the spectacular white sand and clear water.