South Luangwa National Park is a rift valley in the Eastern Province of Zambia run by one wandering river, the Luangwa, whose shifting course leaves oxbow lagoons across the floodplain, holding leopards at some of the highest densities in southern Africa, and it is the valley that invented the walking safari, with an armed scout leading, a guide reading the ground and the visitors in single file, the way Norman Carr first took guests out in the 1950s. The river drops in the dry season from May to October to sandbars and pools, and the game packs onto the last lagoons, elephants, buffalo and the lion prides at their most concentrated, while the hippo pods pile onto the sandbars and into what water is left, dozens of animals wedged into a single bend, grunting and shoving, looked down on from the cut banks; the night drives with a red-filtered spotlight, allowed here as in few parks, are the best chance of watching a leopard hunt or move through the trees, and the walks cover little distance and notice everything, tracks, dung, a leopard's kill hoisted into a sausage tree. Carr hand-reared two orphaned lion cubs before he made his name and taught them to hunt so they could go back to the wild.
From mid-August thousands of southern carmine bee-eaters arrive and burrow nest tunnels into the exposed clay banks of the river, colonies that run for hundreds of metres and glow scarlet, sat under from a boat or the bank with the chicks fed into November. The rains push the river to its brim and flood the valley, when the ebony groves stand in water, the lagoons fill, yellow-billed storks pack a breeding colony in the Nsefu sector and boats reach ground no vehicle can, the emerald season that most camps close for. A family of elephants files through the reception of a lodge near Mfuwe each year to reach a mango tree, since the elephants had the path first. South Luangwa is a valley that a river keeps redrawing, and it is walked rather than driven.