This small coastal park sits in the narrowest part of the Thai peninsula, overlooking the Gulf of Thailand. Covering 98 sq km (38 sq miles), it is a region of contrasts: sea, sand, and marsh backed by mountains and caves. The park is best known for its distinctive limestone pinnacles (Khao Sam Roi Yot means “mountain of 300 peaks”) that rise vertically from the marshland to a height of 650 m (2,150 ft).

The park’s wetlands provide a sanctuary for water birds. Millions of migratory birds flying from Siberia to Sumatra and Australia rest, feed, and breed here between August and April. It is home to many other animals such as the rare dusky langur, the nocturnal slow loris, and the crab-eating macaque. Tham Phraya Nakon  houses a grand pavilion, built for King Rama V in 1896, and Tham Sai  contains fossilized falls.