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There are many things to do in Prachuap Khiri Khan Province - one of the western provinces (changwat) of Thailand. It is in the northern part of the Malay Peninsula, some 240 km (149 mi) south of Bangkok. Neighboring provinces include Phetchaburi to the north and Chumphon to the south. To the west, it borders Tanintharyi Region of Myanmar.
Prachuap Khiri Khan covers an area totaling 6,367 square kilometers (2,458 sq mi). The province is on the Kra Isthmus, the narrow land bridge connecting the Malay Peninsula with mainland Asia. The province has the narrowest part of Thailand, just 12.38 km (7.69 mi) from the Gulf of Thailand to the border with Myanmar in the Tenasserim Hills.
Geographically, Prachuap Khiri Khan is a moderate plain with elevations varying from sea level to 1,200 m (3,900 ft). The maximum elevations are found in the northeastern and central west regions, which make up approximately 30 percent of the province. The total forest area is 2,485 km2 (959 sq mi) or 38.7 percent of provincial area.
The long coast of the Gulf of Thailand has many sandy beaches. One of the best known, Hua Hin, has been a popular resort town since King Prajadhipok (Rama VII) built a summer palace there. From the coast the land quickly rises into the Tenasserim Hills, the mountain chain that forms the border with Myanmar. Due to its narrow watershed, the rivers in the province are all small. The only one of significance is the Pranburi River in the north. Among the smaller rivers is the Khlong Kui.
Prachuap Khiri Khan has a dubbed as "Mueang Sam Ao", which meaning "city of three bays", refers to Ao Noi, Ao Prachup, and Ao Manao all three bays are lined up and are located in the area of Mueang Prachuap Khiri Khan District.