Prachuap Khiri Khan is the province occupying Thailand’s narrowest possession on the Isthmus of Kra, the land bridge connecting the Malay Peninsula with mainland Asia.
This province is an attractive alternative destination for visitors who want to avoid overcrowded resorts, while it is easily accessible from Bangkok. There are plenty of peaceful lesser-known attractions, particularly as you venture away from the main town. It is also a popular destination among Thais so the province can perhaps give travelers a greater insight into the “real” Thailand.
(http://www.tourismthailand.org/where-to-go/cities-guide/destination/prachuap-khiri-khan/)