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 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 which are called the Bia National Park and the Bia Resource Reserve.