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
Tonga people (Zambia and Zimbabwe) and 137,000 in Zimbabwe; it is an important lingua franca in parts of those countries and is spoken by members of other ethnic groups as well as the Tonga. Tonga also speak Shona and Ndebele in Zimbabwe, English in Zambia and Zimbabwe, and Portuguese in Mozambique as second languages. Tonga people (Zambia and Zimbabwe) The Tonga people of Zambia and Zimbabwe (also called 'Batonga') are a Bantu ethnic group of southern Zambia and neighbouring northern Zimbabwe, and to a lesser extent, in Mozambique. They are related to the Batoka who are part of the Tokaleya people in the same area,