Khao Sam Roi Yot is a marine national park in Kui Buri District, Prachuap Khiri Khan Province, Thailand. It covers 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 park includes Thailand's largest freshwater marsh.

Oprning Time : 8.00 AM - 3.30 PM (Everyday)