Kivu province's refugee camps such as Mugunga and Mubambiro because of decades of war. The term Batwa is used to cover a number of different cultural groups, while many Batwa in various parts of the DRC call themselves Bambuti. Arab and colonial accounts speak of Twa on either side of the Lomami River southwest of Kisangani, and on the Tshuapa River and its tributary the "Bussera". Among the Mongo, on the rare occasions of caste mixing, the child is raised as Twa. If this is a common pattern with Twa groups, it may explain why the Twa are less physically distinct from their patrons than the Mbenga and Mbuti, where village men take Pygmy women out of the forest as wives. The Congolese variant of the name, at least in Mongo, Kasai, and Katanga, is Cwa. Uganda The Batwa of Uganda were forest dwellers who lived by gathering and hunting as their main source of food. They are believed to have lived in the Bwindi Impenetrable and Mgahinga National parks that border the Democratic Republic of Congo (DRC) and Rwanda living mainly in areas bordering other Bantu Tribes. In 1992 the Bwindi Impenetrable Forest became a national park and a World Heritage Site to protect the 350 endangered mountain gorillas within its boundaries. As a result the Batwa were evicted from the park. Since they had no title to the land, they were given no compensation. The Batwa became conservation refugees in an unforested environment unfamiliar to them. Poverty, drugs and alcohol abuse were rampant, as well as a lack of education facilities, HIV as well as gender-based violence and discrimination were higher among Batwa communities than among the neighboring Bantu communities. Angola and Namibia Southern Angola through central Namibia had Twa populations when Europeans first arrived in the 16th century. Estermann writes, These peoples live in desert environments. Accounts are limited and tend to confuse the Twa with the San. Zambia and Botswana The Twa of these countries live in swampy areas, such as the Twa fishermen of the Bangweulu Swamps, Lukanga Swamp, and Kafue Flats of Zambia; only the Twa fish in Southern Province, where the swampy terrain means that large-scale crops cannot be planted near the best fishing grounds. The geneticist Cavalli-Sforza also shows Twa near Lake Mweru on the Zambia–Congo border. There are two obvious possibilities: the Luapula Swamps, and the swamps of Lake Mweru Wantipa.