Namibia is divided from west to east into three main topographic zones: the coastal Namib desert, the Central Plateau, and the Kalahari. The Namib is partly rocky and partly (in the central stretch) dunes. While having complex flora and fauna, it is a fragile and sparsely covered environment unsuitable for pastoral or agricultural activities. Diamonds (probably washed down from the Basotho highlands by the Orange River) and uranium are found at Oranjemund in the south and Arandis in the centre. The Namib, 50 to 80 miles wide over most of its length, is constricted in the north where the Kaokoveld, the western mountain scarp of the Central Plateau, abuts on the sea.
The Central Plateau, which varies in altitude from 3,200 to 6,500 feet (975 to 1,980 metres), is the core of the agricultural life of Namibia. In the north it abuts on the Kunene and Okavango river valleys and in the south on the Orange. Largely savanna and scrub, it is somewhat more wooded in parts of the north and is broken throughout by hills, mountains, ravines (including the massive Fish River Canyon), and salt pans (notably the Etosha Pan). Brandberg, also known as Mount Brand (8,442 feet [2,573 metres]), is Namibia’s highest mountain and is located along the plateau’s western escarpment.
In the east, Namibia slopes gradually downward, and the savanna merges into the Kalahari. In the north, hardpan and rock beneath the sand, in addition to more abundant river water and rainfall, make both herding and cultivation possible.
Drainage and soils
As noted, only the border rivers are permanent. The Swakop and Kuiseb rivers rise on the plateau, descend the western escarpment, and die out in the Namib (except in rare flood years, when they reach the sea at Swakopmund and Walvis Bay, respectively). The Fish (Vis) River rises in the Central Plateau and (seasonally) flows south to the Orange. Various lesser rivers rise on the plateau and die out downstream in the Namib or Kalahari desert.
Namibia’s soils range from barren sand and rock to low-quality sand-dominated to relatively fertile soils. The best soils are in the north, in the Otavi Mountains, in parts of the central and southern portions of the plateau, and in the Caprivi Strip. Water—not soil fertility—is the primary constraint on agriculture. Both in the densely populated Ovambo region in the north and in the commercial farming areas, overuse of land has reduced tree and bush cover, compacted soils, led to serious erosion, and lowered the water table by as much as 100 feet in the 20th century.
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