The Khao Ang Rue Nai Wildlife Sanctuary is a protected area located at the western end of the Cardamom Mountains in Chachoengsao Province. Khao Ang Rue Nai Wildlife Sanctuary is the conserved forest covered located in the forest in the junction of 5 provinces: Chachoengsao, Chonburi, Rayong, Chanthaburi, and Prachin Buri. This fertile forest is the last of the east. General landscape is about 30-150 meters high above sea level. It is the origin of Bang Pakong River in Chachoengsao, Khlong Tanod in Chanthaburi, and Prasae River in Rayong.