The Auob River's course, a Nossob tributary
|Country||Botswana, Namibia and South Africa|
|- location||Otjihavera Range, Namibia|
|- elevation||1,900 m (6,234 ft)|
|Secondary source||Confluence of the Swart-Nossob and Wit-Nossob|
|- elevation||1,565 m (5,135 ft)|
|- elevation||890 m (2,920 ft)|
The Nossob (also Nosob or Nossop) River (≠nuse !ab, Khoikhoi for black river) is a dry river bed in eastern Namibia and the Kalahari region of South Africa and Botswana. It covers a distance of 740km and last flooded in 1989. The river also lends its name to Nossob camp in the Kgalagadi Transfrontier Park.
The Nossob has its origin in two main tributaries, the Swart-Nossob and Wit-Nossob, meaning black and white respectively. Both tributaries have their origins in the eastern slopes of the Otjihavera mountain range, east of Windhoek. Their sources are at 1,800m and over 2,000m above sea level respectively. The two river beds have their confluence some 80km south of Gobabis, which is situated on the bank of the Swart-Nossob.
From this confluence the river course passes the settlements of Leonardville and Aranos to arrive at Union's End, South Africa. From Union's End the river bed, forming the Botswana border, meanders through the Kgalagadi Transfrontier Park for a distance of over 200km. It reaches the southern boundary of the game reserve just north of Twee Rivieren Camp, near its confluence with the Auob river.
In the Kalahari, the Nossob is said to flow about once a century. However, water does flow underground to provide life for grass and camelthorn trees growing in the river bed. The Nossob may flow briefly after large thunderstorms, causing wildlife to flock to the river.
The Nossob ends at a confluence with the Molopo River some 50km south of Twee Rivieren. The confluence at is still 890m above sea level. The Molopo is in turn a tributary of the Orange River, which it meets downstream of Augrabies Falls.
Important dams in the basin, both on the Oanob River, a tributary of the Auob:
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