evidence: The Orange River (from Afrikaans/Dutch: Oranjerivier) is a river in Southern Africa. It is the longest river in South Africa. With a total length of 2,432 km (1,511 mi), the Orange River Basin extends from Lesotho into South Africa and Namibia 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 Lesotho and between South Africa and Namibia, 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 the Orange River in honour of the Dutch ruling family, the House of Orange, by the Dutch explorer Robert Jacob Gordon. [...] - Map of portion of Orange River basin forming part of South Africa - "Seeing Orange in the Kalahari", article and astronaut photo at NASA Earth Observatory, July 18, 2021 - Information on the Orange River from the South African Department of Water Affairs and Forestry - Rivers of Lesotho - Orange River - Geography of ǁKaras Region - Internal borders of South Africa - International rivers of Africa - Karoo - Lesotho–South Africa border - Namibia–South Africa border - Ramsar sites in Namibia - Ramsar sites in South Africa - Rivers of Namibia - Rivers of the Eastern Cape - Rivers of the Free State (province)