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Koh Tachai is halfway between the main Similan Islands and the Surin Islands. It is far too exposed to be a good overnight anchorage. However, the island is popular as a daytime stop with very good diving and snorkelling. It also has a reputation for abundant manta rays and whale sharks.
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77 miles from Patong Bay
NOTE: The following information regarding on shore facilities at Koh Tachai applies only if/when the island reopens to tourists. Anchor only on sand in 10-15 metres at Koh Tachai, just north of the eastern point and slightly east of the reef from the beach. Better still, pick up one of the big orange government moorings outside the reef edge on the south or north ends of the beach where the fringing coral is closer to shore. The National Park Camp Ground is in the middle of the beach behind the tree line.
Koh Tachai was closed to day visitors indefinitely in May 2016 to help regenerate coral that had suffered extensive anchor damage. National Parks advised that the island remains closed for all day trip activities at the time of this update in 2025. However, diving is permitted during the Similan Islands ‘open season’ at some of Koh Tachai’s dive sites. Shore access, though, is prohibited.
