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The Vaal River is a major river in South Africa that flows through the country's interior regions. It is an important water source for agriculture, industry, and drinking water for millions of people in South Africa.
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The Vaal River (/ˈvɑːl/ Afrikaans pronunciation: [ˈfɑːl]; Khoemana: ǀHaiǃarib) is the largest tributary of the Orange River in South Africa. The river has its source near Breyten in Mpumalanga province, east of Johannesburg and about 30 kilometres (19 mi) north of Ermelo and only about 240 kilometres (150 mi) from the Indian Ocean. It then flows westwards to its confluence with the Orange River southwest of Kimberley in the Northern Cape. It is 1,458 kilometres (906 mi) long, and forms the border between Mpumalanga, Gauteng and North West Province on its north bank, and the Free State on its south.
It is the third largest river in South Africa after the Orange River (2200 km long) and the Limpopo River (1750 km long) and was established as the main source of water for the great Witswatersrand area after the 19th century gold rush. The Vaal Dam lies on the Vaal River in Deneysville just south of the border between Gauteng and the Free State. The Vaal River is the longest river wholly within the borders of South Africa.