Khao Sam Roi Yot National Park

Khao Sam Roi Yot National Park is Thailand's first marine national park, established in 1966 in Sam Roi Yot District, Prachuap Khiri Khan Province, about 60 km south of Hua Hin. Covering 98 sq km of limestone mountains, caves, beaches and freshwater marshes, it is noted for Phraya Nakhon Cave with its royal pavilion, diverse birdlife, and coastal scenery. The park combines karst landscapes, wetlands and Gulf of Thailand coastline.

Visitors can expect a coastal karst landscape with limestone hills rising to 605 meters, secluded beaches, caves, and the large Thung Sam Roi Yot freshwater marsh. The main attraction is Phraya Nakhon Cave, reached by boat from Bang Pu village and a steep uphill trail, containing the Khuha Kharuehat Pavilion illuminated by sunlight through the cave roof. Other areas include Laem Sala Beach, Khao Daeng viewpoint, Sai and Kaeo caves, mangroves, and boardwalks for birdwatching and photography.