Khao Sam Roi Yot is a marine national park covering 98.08 km², of which 20.88 km² are marine areas. The park was established in 1966, and was the first coastal national park of Thailand.
The name Khao Sam Roi Yot means Mountains with 300 peaks, which describes the landscape of the park quite well. Between the hills are freshwater marshes. However several of these marshes were converted into shrimp farms.
Khao Sam Roi Yot has a variety of ecology system, composing of sea, beaches, mangrove forests, freshwater, marsh land, and limestone mountain, which make the areas are appropriated to be living place of any kind of animals, particularly birds.
