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
Luena River, Zambia km wide at its mouth. In the dry season, vehicle tracks cross the Luena/Ndandu floodplain between north and south, allowing a direct route between Mongu and Lukulu and North-Western Province, Zambia. In the wet season the floodplain is impassable and vehicles have to travel west towards Kaoma, then north-west on the Kaoma-Lukulu road. At the height of the flood this road also becomes impassable across the floodplain, and there is no practical alternative. Luena River, Zambia The Luena River of Zambia's Western Province rises just west of the Kafue National Park and flows west through Kaoma to become a tributary