In Namibia, it is sparsely distributed in the rivers and wetlands of the north-east (e.g. the Mahango area of the Bwabwata National Park on the Okavango River, and the Kwando and Zambezi rivers), but also occurs in sewage works and dams in central Namibia (e.g. Walvis Bay, Daan Viljoen Game Park and Windhoek sewage works), and in the Fish and Orange rivers. Numbers of the African subspecies are estimated at 25,000 to 100,000 birds, and Namibia's population is estimated at fewer than 1,000 birds (1% to 4% of the world population).