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
R3 road (Zimbabwe) in Zimbabwe connecting Zambia and South Africa. The first is from Lusaka to Beitbridge via Victoria Falls and the other is from Lusaka to Beitbridge via Chirundu, Zimbabwe. The Chirundu Route is shorter but not the fastest. For Trans-African Highway transporters, both Zimbabwean routes are slower and costly. Together with the R5 Highways it forms part of the Beira-Lobito Highway which is the Trans-African Highway Network route number 9. The A1 Highway is currently under rehabilitation together with other regional road corridors in Zimbabwe. Most highways in Zimbabwe are more than 30 years old, outliving their 20-year life span, and