| Lake Rukwa | |
|---|---|
 Lake Rukwa, as seen from space. | |
  Lake Rukwa | |
 | |
| Location | Rukwa Region, Songwe Region and Katavi Region, Tanzania. |
| Coordinates | 8°00′S32°25′E / 8.000°S 32.417°E |
| Type | alkaline |
| Catchment area | 88,000 km2 (34,000 sq mi) [1] |
| Basin countries | Tanzania |
| Surface elevation | 800 metres (2,600 ft) |
Lake Rukwa is an endorheic lake located the Rukwa Valley of Rukwa Region, Songwe Region and Katavi Region in southwestern Tanzania. The lake is the third largest inland body of water in the country.
The alkaline Lake Rukwa lies midway between Lake Tanganyika and Lake Malawi at an elevation of about 800 metres (2,600 ft), in a parallel branch of the rift system. Almost half of the lake lies in Uwanda Game Reserve. [2]
The lake has seen large fluctuations in its size over the years, due to varying inflow of streams. Currently it is about 180 kilometres (110 mi) long and averages about 32 kilometres (20 mi) wide, making it about 5,760 square kilometres (2,220 sq mi) in size. [3] In 1929 it was only about 48 kilometres (30 mi) long, but in 1939 it was about 128 kilometres (80 mi) long and 40 kilometres (25 mi) wide. [4] During the early rifting of this part of Africa, the basin of Lake Rukwa may at times have been part of a much larger basin which also included the basins of Lake Tanganyika with Lake Malawi; ancient shorelines suggest a final date of overflow into Lake Tanganyika of 33,000BP. [5] For overflow to occur again, the lake's elevation would need to exceed 900 meters. Overflow into Lake Malawi is not possible now, since the pass between the two basin stands at over 2000 meters elevation. [6] (Neither Lake Tanganyika nor Lake Malawi can overflow into Lake Rukwa since they already overflow into the Atlantic and Indian Oceans respectively.)
There is an accumulation of heavy metals like zinc, mercury, copper, lead, chromium, and nickel in sediment, water, and the muscle tissues of Clarias gariepinus (African catfish) and Oreochromis esculentus (Singida tilapia) in Lake Rukwa. [7]
In 2016, an estimated 1.53 billion cubic meters (54.2 billion standard cubic feet) volume of helium gas was discovered in Lake Rukwa worth $3.5 billion. [8]
Tanzania comprises many lakes, national parks, and Africa's highest point, Mount Kilimanjaro. Northeast Tanzania is mountainous, while the central area is part of a large plateau covered in grasslands. The country also contains the southern portion of Lake Victoria on its northern border with Uganda and Kenya.
Lake Malawi, also known as Lake Nyasa in Tanzania and Lago Niassa in Mozambique, is an African Great Lake and the southernmost lake in the East African Rift system, located between Malawi, Mozambique and Tanzania.
Lake Tanganyika is an African Great Lake. It is the second-oldest freshwater lake in the world, the second-largest by volume, and the second deepest, in all cases after Lake Baikal in Siberia. It is the world's longest freshwater lake. The lake is shared among four countries—Tanzania, the Democratic Republic of the Congo (DRC), Burundi, and Zambia—with Tanzania (46%) and DRC (40%) possessing the majority of the lake. It drains into the Congo River system and ultimately into the Atlantic Ocean.
Lake Albert, originally known as Lake Mwitanzige by the Banyoro, Nam Ovoyo Bonyo by the Alur and temporarily Lake Mobutu Sese Seko, is a lake located in Uganda and the Democratic Republic of the Congo. It is Africa's seventh-largest lake, as well as the second biggest of Uganda's Great Lakes.
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 explorer and officer Gustav Adolf von Götzen was the first European to discover the lake.
The African Great Lakes are a series of lakes constituting the part of the Rift Valley lakes in and around the East African Rift. The series includes Lake Victoria, the third-largest freshwater lake in the world by area; Lake Tanganyika, the world's second-largest freshwater lake by volume and depth; Lake Malawi, the world's eighth-largest freshwater lake by area; and Lake Turkana, the world's largest permanent desert lake and the world's largest alkaline lake. Collectively, they contain 31,000 km3 (7,400 cu mi) of water, which is more than either Lake Baikal or the North American Great Lakes. This total constitutes about 25% of the planet's unfrozen surface fresh water. The large rift lakes of Africa are the ancient home of great biodiversity, and 10% of the world's fish species live in this region.
The Rift Valley lakes are a series of lakes in the East African Rift valley that runs through eastern Africa from Ethiopia in the north to Malawi in the south, and includes the African Great Lakes in the south. These include some of the world's oldest lakes, deepest lakes, largest lakes by area, and largest lakes by volume. Many are freshwater ecoregions of great biodiversity, while others are alkaline "soda lakes" supporting highly specialised organisms.
The Luangwa River is one of the major tributaries of the Zambezi River, and one of the four biggest rivers of Zambia. The river generally floods in the rainy season and then falls considerably in the dry season. It is one of the biggest unaltered rivers in Southern Africa and the 52,000 square kilometres (20,000 sq mi) that make up the surrounding valley are home to abundant wildlife.
The Ruzizi 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.
Rukwa Region(Mkoa wa Rukwa in Swahili) is one of Tanzania's 31 administrative regions The region covers a land area of 27,765 km2 (10,720 sq mi). The region is comparable in size to the combined land area of the nation state of Haiti. Rukwa Region is bordered to the north by Katavi Region, to the east by Songwe Region, to the south by the nation of Zambia and to the west by Lake Tanganyika, which forms a border between Tanzania and the Democratic Republic of the Congo. The regional capital is the municipality of Sumbawanga. According to the 2022 national census, the region had a population of 1,540,519.
Mbeya Region is one of Tanzania's 31 administrative regions. The region covers an area of 35,954 km2 (13,882 sq mi). The region is comparable in size to the combined land area of the nation state of Guinea Bissau. Mbeya Region is bordered to the east by Singida Region, Iringa Region and Njombe Region. The region is bordered to the south by Malawi and Lake Nyasa. To the north the region borders southern Tabora Region. Lastly, Mbeya is bordered to the west by Songwe Region. The regional capital is the city of Mbeya. According to the 2022 national census, the region had a population of 2,343,754.
Mount Rungwe is a volcanic mountain in Mbeya Region, in Tanzania's Southern Highlands. At an altitude of 2,981 metres (9,780 ft), it is southern Tanzania's second-highest peak. Rungwe's volcano is currently inactive.
The Kalambo River forms part of the border between Zambia and Tanzania. It is a comparatively small stream which rises on the Ufipa Plateau in Rukwa Region,Tanzania north-east of Mbala at an elevation of about 1800 m and descends into the Albertine Rift, entering the southeastern end of Lake Tanganyika at an elevation of about 770 m, in a straight-line distance of only about 50 km. This accounts for its main claim to fame, its waterfall, Kalambo Falls, which is Africa's second highest falls. Below the falls, the river runs in a deep gorge.
The Malagarasi River is a river in western Tanzania, flowing through Kigoma Region, although one of its tributaries comes from southeastern Burundi. The river also forms the western border of Tabora Region, the southern border of Kagera Region and the southwestern border of Geita Region. It is the second-longest river in Tanzania behind the Rufiji—Great Ruaha, and has the largest watershed of any river flowing into Lake Tanganyika. The Malagarasi-Muyovozi Wetlands are a designated a Ramsar site. Local tribes have nicknamed the Malagarasi as "the river of bad spirits".
The Southern Highlands is a highland region in southwestern Tanzania, at the northern end of Lake Malawi. The highlands include portions of Mbeya, Njombe, Rukwa, Ruvuma, and Songwe regions, bordering Malawi, Mozambique, and Zambia. Mbeya is the largest city in the highlands.
The Rukwa Valley is a valley located in Rukwa Region, Songwe Region and Katavi Region in southwestern Tanzania. The valley is a part of the Great Rift Valley. Sparsely populated because of its harsh environment, its grassland biodiversity includes thousands of species.
The Congo–Nile Divide or the Nile–Congo Watershed is the continental divide that separates the drainage basins of the Congo and Nile rivers. It is about 2,000 kilometres (1,200 mi) long.
The geology of Malawi formed on extremely ancient crystalline basement rock, which was metamorphosed and intruded by igneous rocks during several orogeny mountain building events in the past one billion years. The rocks of the Karoo Supergroup and newer sedimentary units deposited across much of Malawi in the last 251 million years, in connection with a large rift basin on the supercontinent Gondwana and the more recent rifting that has created the East African Rift, which holds Lake Malawi. The country has extensive mineral reserves, many of them poorly understood or not exploited, including coal, vermiculite, rare earth elements and bauxite.
The geology of Tanzania began to form in the Precambrian, in the Archean and Proterozoic eons, in some cases more than 2.5 billion years ago. Igneous and metamorphic crystalline basement rock forms the Archean Tanzania Craton, which is surrounded by the Proterozoic Ubendian belt, Mozambique Belt and Karagwe-Ankole Belt. The region experienced downwarping of the crust during the Paleozoic and Mesozoic, as the massive Karoo Supergroup deposited. Within the past 100 million years, Tanzania has experienced marine sedimentary rock deposition along the coast and rift formation inland, which has produced large rift lakes. Tanzania has extensive, but poorly explored and exploited natural resources, including coal, gold, diamonds, graphite and clays.
The Ufipa Plateau is a highland in southwestern Tanzania. It lies mostly in Rukwa Region, near the border with Zambia. The plateau is named for the Fipa people who inhabit it.
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