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 of the Zambezi. In the dry season, just below its confluence with its seasonal tributary the Luampa River, it ends in swamps or marshes on the Luena Flats east of Lukulu. In the wet season the Luena Flats flood and overflow into the Ndandu channel or floodplain which leads south-west to the Barotse Floodplain of Zambezi north of Limulunga and Mongu. It is the widest 'tributary' floodplain of the Barotse Floodplain, reaching 20 kilometres (12 mi) wide at its mouth.