Ruzizi River in the context of "South Kivu"

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⭐ Core Definition: Ruzizi River

The Ruzizi (also sometimes spelled Rusizi, French: Rivière Ruzizi; Dutch: Ruzizi Rivier) is a river, 117 kilometres (73 mi) long, that flows from Lake Kivu to Lake Tanganyika in Central Africa, descending from about 1,500 metres (4,900 ft) to about 770 metres (2,530 ft) above sea level over its length. The steepest gradients occur over the first 40 kilometres (25 mi), where hydroelectric dams have been built. Further downstream, the Ruzizi Plain, the floor of the Western Rift Valley, has gentle hills, and the river flows into Lake Tanganyika through a delta, with one or two small channels splitting off from the main channel.

The Ruzizi is a young river, formed about 10,000 years ago when volcanism associated with continental rifting created the Virunga Mountains. The mountains blocked Lake Kivu's former outlet to the drainage basin of the Nile and instead forced the lake overflow south down the Ruzizi and the drainage basin of the Congo.

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👉 Ruzizi River in the context of South Kivu

South Kivu (Swahili: Jimbo la Kivu Kusini; French: Sud-Kivu) is one of 26 provinces of the Democratic Republic of the Congo. Its capital is Bukavu. Located within the East African Rift's western branch Albertine Rift, it is bordered to the east by Lake Kivu, Rwanda, Burundi, and Tanzania; to the west by Maniema Province; to the north by North Kivu Province; and the south by Tanganyika Province. The province covers an area of approximately 69,130 square kilometers and has an estimated population of 8,147,400 as of 2024.

The region has historically been inhabited by various Bantu-speaking ethnic groups, including the Bamushi, Bafuliiru, Bahavu, Banyindu, Babembe, Babuyu, Balega, Babwari, Baholoholo, Banyanga, Bavira, Bakusu, Batembo, Barongeronge, and Baswaga, as well as Pygmy communities. During the colonial period, the borders of the Congo Free State were established by the 1885 Berlin Conference, placing all of Lake Kivu and both banks of the Ruzizi River within the Free State. The region's boundaries were later subject to disputes, including the Kivu frontier incident of 1909, which was resolved in 1910 when the eastern portion of Kivu was allocated to Uganda Protectorate and German East Africa. Kivu District was formally created in 1912 and later divided into Sud-Kivu and Nord-Kivu Districts in 1951. After a series of administrative reorganizations, South Kivu became a separate province in 1988, alongside North Kivu and Maniema.

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Ruzizi River in the context of Lake Kivu

Lake Kivu is one of the African Great Lakes. It lies on the border between the Democratic Republic of the Congo and Rwanda, and is in the Albertine Rift, the western branch of the East African Rift. Lake Kivu empties into the Ruzizi River, which flows southwards into Lake Tanganyika. In 1894, German officer and colonial ruler Gustav Adolf von Götzen was the first recorded European to visit the lake.

In the past, Lake Kivu drained toward the north, contributing to the White Nile. About 13,000 to 9,000 years ago, volcanic activity blocked Lake Kivu's outlet to the watershed of the Nile.The volcanism produced mountains, including the Virungas, which rose between Lake Kivu and Lake Edward, to the north. Water from Lake Kivu was then forced south down the Ruzizi. This, in turn, raised the level of Lake Tanganyika, which overflowed down the Lukuga River.

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Ruzizi River in the context of Bukavu

Bukavu is a city in eastern Democratic Republic of the Congo (DRC), lying at the extreme south-western edge of Lake Kivu, west of Cyangugu in Rwanda, and separated from it by the outlet of the Ruzizi River. It is the capital of the South Kivu Province and as of 2012 it had an estimated population of 806,940.

In 2021 it has an estimated urban population of 1,133,000.

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