Tachai Island is located at the northernmost part of the Similan Islands National Park, between the Similan and Surin Islands. Named after its discoverer “Tachai,” the island was once ranked among the most beautiful islands in Thailand due to its untouched natural beauty.

The island was widely known for its powder-soft white sand beach, crystal-clear waters, and rich biodiversity, including the rare “Chicken Crab.” It also offered nature trails and snorkeling spots for visitors.

Due to severe environmental impact from mass tourism, the Department of National Parks, Wildlife and Plant Conservation officially closed the island in 2016 to allow ecosystem recovery.

Currently, Tachai Island remains "indefinitely closed," and tourists are not allowed to access the island. However, nearby dive sites such as Tachai Pinnacle are still accessible via liveaboard diving trips.

This closure serves as a significant case study in sustainable tourism and marine conservation in Thailand.

• The island is currently inaccessible to tourists.

• Always check updates from Department of National Parks, Wildlife and Plant Conservation

• The island is closed indefinitely — no landing allowed

• Visit other Similan Islands instead

• Diving at Tachai Pinnacle requires certification

Admission Fees:

• Thai: Adult 50 THB / Child 20 THB

• Foreigner: Adult 500 THB / Child 300 THB

Opening Hours:

• Closed indefinitely since 2016 for environmental recovery