Located at the northern tip of the Similan Islands National Park is Koh Tachai. The island is the latest addition to the coverage of the National Park area along with Koh Bon. The size of the island is at 12 square kilometers, and it is located at 54 kilometers from the Baan Nam Khem Pier in Khao Lak. Koh Tachai boasts spectacular white beaches and crystal-clear waters surrounding it. Due to its remoteness, Koh Tachai has a strong reputation as one of the best dive sites in Thailand. The National Geographic Society even placed it among the top 10 diving destinations in the world.
While diving with leopard sharks and manta rays is the most popular activity around Koh Tachai, the island has its other perks, too. There is only a beach on Koh Tachai, but it is a beautiful one. Spanning 800 meters, the beach is guarded by a surrounding rainforest that covers it with shade most of the day. You can trek the nature trail to spot hermits, various reptiles, and Nicobar pigeons. This ancient rainforest is full of wonders and mysterious wildlife that is hard to find elsewhere.