Bia National Park is bordered to the south with a 563 square kilometer Resource Reserve and is an International Biosphere Reserve Park.

The reserves are situated in the transition between the moist evergreen and semi-deciduous tropical forest and cover much of the drainage for the Bia river.

Bia became a protected area in 1935 and an official national park in 1974. Some of the tallest trees left in West Africa are found in this park.

There are 62 species of mammals known to exist in the park including 10 primate species (three species of colobus, the Diana monkey and the chimpanzee, Pan troglodytes, among others), leopard, buffalo, the forest elephant, Loxodanta cyclotis, and the bongo, Tragelaphus euryceros.

Over 160 species of birds including hawks, eagles, bulbuls, flycathers, the black-collared lovebird and the threatened white-breasted guinea fowl live in this habitat. The park is the only known home of Agama sylvanus, a newly discovered species of lizard.