The Nossob River

Geography
The Nossob river is a 740 kilometer long river flowing from Namibia and Botswana into South Africa. Its origin is in two rivers, the Swart-Nossob and Wit-Nossob, in the Otjihavera mountain range, east of Windhoek in Namibia. The Swart-Nossob (Black Nossob) and Wit-Nossob (White Nossob) confluence south of Gobabis in east-Namibia. The Nossob then goes south and enters South Africa at Union's End, which was the most northern point of the Union of South Afica (the Natal and Cape colonies under British rule from May 1910 to May 1961). Today Union's End is the extreme northwesterly point of South Africa. It marks the meeting place of the borders of South Africa, Botswana and Namibia. Namibia is fenced off from Botswana and South Africa. But, as Union's End lies in the Transfrontier park, there is no fence between Botswana and South Africa at this point. The centre of the Nossob, which is the boundary between the two countries for some 200 kilometers, is marked at intervals by cement bollards with RSA and RB etched on the appropriate sides.
Just north of Twee Rivieren the Auob river merges into the Nossob, flowing south. Some 60 kilometers south, near the village of Molopo, the Nossob confluences with the Molopo river.

General information
The word Nossob is derived from the Khoekhoe word "‡No ab". Modern speakers of the language are not certain whether "‡No" refers to 'Black' or 'Dry'. In the old language, N|u, the river is called ||o, meaning 'Dry'.
In the Kalahari, they saying goes that the Nossob river only flows about once a century; the last times it really did flow in the Kalahari was in 1989.