Zambia and south covering about three-quarters of the country; and the Congo basin in the north covering about one-quarter of the country. A very small area in the northeast forms part of the internal drainage basin of Lake Rukwa in Tanzania. In the Zambezi basin, there are a number of major rivers flowing wholly or partially through Zambia: the Kabompo, Lungwebungu, Kafue, Luangwa, and the Zambezi itself, which flows through the country in the west and then forms its southern border with Namibia, Botswana and Zimbabwe. Its source is in Zambia but it diverts into Angola, and a number of its
Zimbabweans in Zambia exported more corn than it imported. Zambia was considered the "easy option" for Zimbabwean farmers as compared to other potential destinations such as Malawi or Nigeria due to the close resemblance between the soil and climate of Zambia and that of Zimbabwe, as well as Zambia's relative stability; however, farmers who relocated to Zambia typically took on heavy debts denominated in Zambian kwacha while selling their produce abroad for U.S. dollars, which put them into difficulties when the kwacha appreciated almost one-third against the dollar in 2006. Zimbabwean leader Robert Mugabe harshly criticised his Zambian counterpart Levy Mwanawasa for taking