Her course only occasionally exposes hard rock but where it does the
results can be spectacular. At the Victoria Falls a flow which has been
wide and relatively gentle (there are a few tricky rapids ...) suddenly
drops over the edge of the world and is confined to a narrow canyon.
At Sioma, a couple of hundred miles (300km+)
upriver, the Ngonye Falls have a gentler beauty, but the rocky lip that
sets them there is the spillway for a great sand filled basin, the Barotse
Plain, heartland of the Lozi people.