evidence: The Orange River, also known as the Gariep River, has a rich history dating back centuries. It is the largest river in South Africa. It forms part of the extensive river system in Southern Africa, with one of its major tributaries being the Caledon River. [...] The Orange River, also known as the Gariep River, is located in Southern Africa. It is the longest river in South Africa and the third-longest river on the African continent. The river originates in the Drakensberg Mountains in Lesotho and the river flows further westward through South Africa, forming part of the international borders between South Africa and Namibia, as well as between South Africa and Lesotho. [...] The Orange River, a pivotal feature in Southern Africa, is encompassed by various geographical and hydrological elements. As part of the Orange River scheme, it originates in the Drakensberg Mountains, and its course is marked by a deeply incised river bed, with notable gravel deposits both in the river and along its banks. As the river then runs westward, its flow is significantly shaped by these geological characteristics. The Orange River, supposedly named for the orange color of its water under certain conditions, holds historical significance, particularly during the South African Diamond Rush. As the river makes its journey towards the Atlantic, it flows through diverse landscapes, including wine-producing areas around its mouth.