Water supply and sanitation in Zimbabwe in Zimbabwe are the Zambezi River in the north, and the Limpopo River in the south. Several other rivers with significant watershed areas that flow through Zimbabwe are the Save, Manyame, and Sanyati Rivers. The biggest lake in Zimbabwe is Lake Kariba which is on the border with Zambia. There are several large aquifers in Zimbabwe. In urban centers of Zimbabwe the majority of the water supply comes from piped water. In rural areas, Zimbabweans predominantly rely on wells and boreholes that tap into Zimbabwe's groundwater supply. The construction of many wells was mainly financed by the households themselves. The
Zambia Democratic Republic of Congo (47,300 refugees from the DRC living in Zambia in 2007), Angola (27,100; see Angolans in Zambia), Zimbabwe (5,400) and Rwanda (4,900). Beginning in May 2008, the number of Zimbabweans in Zambia also began to increase significantly; the influx consisted largely of Zimbabweans formerly living in South Africa who were fleeing xenophobic violence there. Nearly 60,000 refugees live in camps in Zambia, while 50,000 are mixed in with the local populations. Refugees who wish to work in Zambia must apply for official permits which can cost up to $500 per year. Zambia is officially a Christian nation