Koh Tachai is located at the northern tip of the Similan Islands National Park and the latest addition to the coverage of the National Park area along with Koh Bon. Koh Tachai boasts spectacular white beaches and crystal-clear waters surrounding it.

According to National Geographic Society Koh Tachai is due to its remoteness among the top 10 diving destinations in the world. On the island you can trek the nature trail to spot hermits, various reptiles, and Nicobar pigeons. This ancient jungle is full of wonders and mysterious wildlife that is hard to find elsewhere.