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
P12 road (Zimbabwe) Highway which runs from Lusaka to Chirundu. Here it is called the Siavonga Road. On the Zimbabwean side its begins from a junction with R3/A1 Highway which runs from Harare to Chirundu at Makuti. For those not worried about crossing borders the M15 Highway is the shortest route from Chirundu, Zimbabwe to Kariba via Chirundu, Zambia and Siabonga. It is only 72 km, which is the Chirundu, Zimbabwe to Kariba via Makuti's 144 km. From the Chirundu Border Post to the M15 Highway junction with Zambia's T2 Highway is 19 km, then 53 km to Kariba. (SOURCE MAPS) The Highway