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Concept
Lake Kivu
Summary
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 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.
Lake Kivu is approximately long and at its widest. Its irregular shape makes measuring its precise surface area difficult; it has been estimated to cover a total surface area of some , making it Africa's eighth largest lake. The surface of the lake sits at a height of above sea level. This lake has a chance of suffering a limnic eruption every 1000 years. The lake has a maximum depth of and a mean depth of , making it the world's twentieth deepest lake by maximum depth, and the thirteenth deepest by mean depth.
Some or 58 percent of the lake's waters lie within DRC borders.
The lake bed sits upon a rift valley that is slowly being pulled apart, causing volcanic activity in the area.
The world's tenth-largest island in a lake, Idjwi, lies in Lake Kivu, within the boundaries of Virunga National Park. Settlements on the lake's shore include Bukavu, Kabare, Kalehe, Sake and Goma in the Democratic Republic of the Congo, and Gisenyi, Kibuye, and Cyangugu in Rwanda.
Lake Kivu is a fresh water lake and, along with Cameroonian Lake Nyos and Lake Monoun, is one of three that are known to undergo limnic eruptions (where overturn of deepwater stratified layers releases dissolved carbon dioxide). Around the lake, geologists found evidence of massive local extinctions about every thousand years, presumably caused by outgassing events.
Official source
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