Originally, it consisted of six tambons: Yan Ta Khao, Nong Bo, and Thung Khai were split off from Kantang District, Na Chum Het from Mueang Trang District, and Nai Khuan and Phrong Chorakhe from Palian District.
Originally, the area consisted of six tambons: Yan Ta Khao, Nong Bo, and Thung Khai were detached from Kantang District, Na Chum Het was derived from Mueang Trang District, and Nai Khuan and Phrong Chorakhe originated from Palian District.