 On 16 December 1978 the minor district ("king amphoe") was created.On 16 March 1985 it was upgraded to a full district.Neighboring districts are (from the north clockwise) Ko Chan of Chonburi Province, Tha Takiap of Chachoengsao Province, Kaeng Hang Maeo of Chanthaburi Province, Khao Chamao and Wang Chan of Rayong Province, and Nong Yai, Ban Bueng and Phanat Nikhom of Chonburi.