The park is in the south central part of Sorsogon Province, southern Luzon, Bicol Region, Philippines, bounded by five municipalities: Bulusan, Barcelona, Irosin, Juban and Casiguran.

Other habitats include secondary grassland, freshwater lakes and pools, small settlements and rural gardens, abandoned farmland and disturbed ground.

It is the source of water for several communities and for the irrigation of surrounding agricultural land, and it provides natural protection from calamities such as typhoons and flash floods.

[6] Philippine brown deer, warty pigs and rare civets were spotted in the area in the late 1980s, although there is no evidences of their existence in the park at present.

As the natural habitats declined over the years as a result of extensive kaingin, heavy hunting, and human settling, cooperating municipalities especially Bulusan and Irosin joined in responding to conservation efforts.