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Mambilima Falls is a series of rapids on the Luapula River on the boundary between Zambia and the Democratic Republic of the Congo. The falls used to be called the Johnstone Falls. They extend along a 5 kilometres (3.1 mi) stretch of the river.
Below Lake Bangweulu the Luapula is a broad, swamplike system flowing southward that turns west and descends the steep Mambatuta Falls before meandering north to the Mambilima falls, The lush and densely populated Luapula valley opens out beyond the Mambilima falls into a huge area of marshes, floodpains and lagoons at the southern end of Lake Mweru. There is an almost continuous stretch of villages from the falls to the lake. Traditionally, the fishermen near the falls used dams, weirs and traps to catch as many fish as possible before the flood water receded. The fish of Lake Mweru do not spawn south of the waterfalls and rapids, where Lake Bangweulu has a distinct ecology.