Bia National Park is a national park in the Bia district in the Western Region of Ghana. It is also a biosphere reserve with a 563 square kilometer (217 square miles) resource reserve. It has some of Ghana's last remnants of relatively untouched forest complete with its full diversity of wildlife. Some of the tallest trees left in West Africa are found in this national park. It constitutes a twin conservation area called the Bia National Park and the Bia Resource Reserve.

Bia was created in 1935 and named after the Bia River which drains the area. It became an official national park in 1974. Intensive farming destroyed much of the original vegetation in the park. However, since 1975, no human activities like farming or logging have taken place. In 1985 the park was named a biosphere reserve and a UNESCO (United Nations Educational, Scientific and Cultural Organization) world heritage site.

There are about 62 species of mammals (including 10 primate species which are the Black-and-White colobus, the olive colobus, red colobus monkeys and chimpanzees) known to live in the park, and over 189 bird species. The park is also the only known home of the newly discovered species of lizard, 'Agama africana'. Ghana's major protected forest antelope communities also live in the park. The forest elephant and the bongo which is claimed to be highly threatened can be found there.

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