Dawn at Sam Roi Yot, Prachuap Khiri Khan, Thailand

Khao Sam Roi Yot (Thai: เขาสามร้อยยอด) is a marine national park in Sam Roi Yot 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 Gulf of Thailand (Thai: อ่าวไทย, RTGS: Ao Thai, Thai pronunciation: [ʔàːw tʰaj]), also known to Malays as Teluk Siam, literally meaning Gulf of Siam, and Boeung Tonle Siem in Khmer, is a shallow arm of the South China Sea.