Zambia tributaries rise in Angola's central highlands. The edge of the Cuando River floodplain (not its main channel) forms Zambia's southwestern border, and via the Chobe River that river contributes very little water to the Zambezi because most is lost by evaporation. Two of the Zambezi's longest and largest tributaries, the Kafue and the Luangwa, flow mainly in Zambia. Their confluences with the Zambezi are on the border with Zimbabwe at Chirundu and Luangwa town respectively. Before its confluence, the Luangwa River forms part of Zambia's border with Mozambique. From Luangwa town, the Zambezi leaves Zambia and flows into Mozambique, and
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