With an area of 650 square kilometers, covers more than 52 islands from the territory of Amphoe Laem Ngop, Amphoe Mueang to Amphoe Khlong Yai. The most famous is Ko Chang. In addition, there are other islands with remaining wonderful nature such as Ko Khlum, Ko Lao Ya Nai, Ko Ngam, Ko Mai Si Yai, Ko Wai, Ko Rang, etc.

The park office is located in the east of Ko Chang, near Khlong Than Mayom, with a large harbour in its front. There are also 3 National Park Protection Units at Ao Khlong Son, Namtok Khlong Phlu’s entrance and Ban Salak Phet, all of which are on Ko Chang.