The long coast of the Gulf of Thailand has many sandy beaches, the most famous one being at Hua Hin, which has been a popular resort since King Prajadhipok (Rama VII) built a summer palace there. From the coast the land quickly rises into the Tanaosi Range, the mountain chain that forms the border with Myanmar, the highest elevation in the province being the 1494-metre-high Khao Luang. Due to this narrow watershed the rivers in the province are all small; the only bigger one is the Pran Buri River in the north of the province. Among the smaller rivers is the Khlong Kui.[1]
Khao Sam Roi Yot National Park was established in 1966 to protect Thailand's largest freshwater marshes. The park contains some mangrove woods and mudflats. Most of the marshes were converted into shrimp farms, despite being in a national park