The Khao Ang Rue Nai Wildlife Sanctuary is a protected area located at the western end of the Cardamom Mountains in Chachoengsao Province. 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.