<P> The Orange River ( 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 , as well as 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 ) . The official name , however , is the Orange River . </P>
<P> The Orange River ( 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 , as well as 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 ) . The official name , however , is the Orange River . </P>
which international border does the gariep-orange follow before it enters the sea
which international border does the gariep-orange follow before it enters the sea
South Africa and Namibia South Africa and Lesotho
South Africa and Namibia South Africa and Lesotho