The Orange River 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 the Orange River in honour of the Dutch ruling family, the House of Orange, by the Dutch explorer Robert Jacob Gordon. Other names include Gariep River, Groote River or Senqu River.
The Umgeni River or Mgeni River, is a river in KwaZulu-Natal, South Africa. It rises in the "Dargle" in the KZN midlands, and its mouth is at Durban, some distance north of Durban's natural harbour. The name is taken to mean the river of entrance in Zulu, though other meanings have been proposed.
The Olifants River, Lepelle or Obalule is a river in South Africa and Mozambique, a tributary of the Limpopo River. It falls into the Drainage Area B of the Drainage basins of South Africa. The historical area of the Pedi people, Sekhukhuneland, is located between the Olifants River and one of its largest tributaries, the Steelpoort River.
Gariep Dam located in South Africa, near the town of Norvalspont, bordering the Free State and Eastern Cape provinces. Its primary purpose is for irrigation, domestic and industrial use as well as for power generation.
The Vanderkloof Dam is situated approximately 130 km (81 mi) downstream from Gariep Dam and is fed by the Orange River, South Africa's largest river. Vanderkloof Dam is the second-largest dam in South Africa, having the highest dam wall in the country at 108 metres (354 ft). The dam was commissioned in 1977; it has a capacity of 3,187.557 million cubic metres (2,584,195 acre⋅ft) and a surface area of 133.43 square kilometres (51.52 sq mi) when full. Other rivers flowing into this dam are the Berg River, two unnamed streams coming in from the direction of Reebokrand, the Knapsak River, Paaiskloofspruit, Seekoei River, Kattegatspruit and the Hondeblaf River, in a clockwise direction.
The Kouga Dam is an arch dam on the Kouga River about 21 km (13 mi) west of Patensie in Kouga Local Municipality, South Africa. It supplies irrigation water to the Kouga and Gamtoos valleys as well as drinking water to the Port Elizabeth metropolitan area via the Loerie Balancing Dam. It was constructed between 1957 and 1969.
Inanda Dam is an earth-fill type dam located on the Mgeni River, near Hillcrest, KwaZulu-Natal, South Africa. It was established in 1989 and its primary purpose is to serve for domestic and industrial use.
Ncora Dam is a gravity type dam located on the Tsomo River, near Tsomo, Eastern Cape, South Africa. It was established in 1972 and serves mainly for irrigation purposes. The hazard potential of the dam has been ranked high (3).
The Bushman's River is an east to north-easterly flowing tributary of the Tugela River, in the KwaZulu-Natal province of South Africa. It rises in the Drakensberg Mountain range, with its upper catchment in the Giant's Castle Game Reserve, north of the Giant's Castle promontory. It feeds the Wagendrift Dam and then flows past the town of Estcourt to join the Tugela River near the town of Weenen.
Hazelmere Dam is a combined concrete gravity type dam located on the Mdloti River, Kwazulu Natal, South Africa. It was established in 1977 and its primary purpose is to serve for irrigation and domestic use. The hazard potential of the dam assembly has been ranked high (3).
The Crocodile River is a river in South Africa. After its confluence with the Marico River, both rivers form the Limpopo River.
Drainage Basin A, is one of the drainage basins of South Africa. The main river in this system is the Limpopo River. It is subdivided into 9 sub-drainage basins.
The Notwane River is a river in southeastern Botswana. Certain sections of its course form the international boundary with South Africa. Its mouth is at the head of the Limpopo River. It has a catchment area of 18,053 square kilometers.
The Bokaa Dam is a dam on the Metsimotlhabe River, a tributary of the Ngotwane River, in Botswana. It provides water to the capital city of Gaborone. It is operated by the Water Utilities Corporation.
The Nnywane Dam is a dam on the Nnywane River in Botswana. The reservoir provides a water supply to Lobatse, a town 70 kilometres (43 mi) south of Gaborone. Water from the reservoir may also be transferred to Gaborone if needed.
The border between Botswana and South Africa is 1,969 kilometres (1,223 mi) long. More than 90% of the border follows rivers, including the Nossob, Molopo, Marico and Limpopo.
