The Bui National Park is found in Ghana. It was established in 1971. This site is 1820 km². The reserve is notable for its Hippopotamus population in the Black Volta. The endangered black and white colobus monkey and a variety of antelopes and birds are also present. Part of the park will be inundated by the reservoir of the Bui Dam, which has been under construction since 2009. The filling of the reservoir is expected to begin in 2011.