<Tr> <Th> Designated </Th> <Td> 28 June 1991 </Td> </Tr> <Tr> <Th> Reference no . </Th> <Td> 526 </Td> </Tr> <P> The Orange River (from Afrikaans / Dutch: Oranjerivier) is the longest river in South Africa and the Orange River Basin extends extensively into Namibia and Botswana to the north . It rises in the Drakensberg mountains in Lesotho, flowing westwards through South Africa to the Atlantic Ocean . The river forms part of the international borders between South Africa and Namibia and between South Africa and Lesotho, as well as several provincial borders within South Africa . Except for Upington, it does not pass through any major cities . The Orange River plays an important role in the South African economy by providing water for irrigation and hydroelectric power . The river was named by Robert Jacob Gordon after the Dutch Royal House . Other names include Gariep River (used by the Khoi people), Groote River or Senqu River (used in Lesotho). </P> <P> The Orange rises in the Drakensberg mountains along the border between South Africa and Lesotho, about 193 km (120 mi) west of the Indian Ocean and at an altitude of over 3,000 m . The extremity of the Orange River inside Lesotho is known as the Senqu . Parts of the Senqu River freeze in winter because of the high altitude there . This creates droughts downstream, which mainly affect goat and cattle production . </P>

Where does the orange river start and end
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