The Congo River , formerly also known as the Zaire River , is the second-longest river in Africa , shorter only than the Nile , as well as the third-largest river in the world by discharge volume, following the Amazon and Ganges rivers. It is the world's deepest recorded river, with measured depths of around 220 m (720 ft). The Congo– Lualaba – Luvua – Luapula – Chambeshi River system has an overall length of 4,700 km (2,900 mi), which makes it the world's ninth- longest river . The Chambeshi is a tributary of the Lualaba River , and Lualaba is the name of the Congo River upstream of Boyoma Falls , extending for 1,800 km (1,100 mi).
43-650: Ikengo is a village in Équateur Province, Democratic Republic of the Congo, on the left bank of the Congo River . Ikengo is in Équateur Province, on the left bank of the Congo River about 20 kilometres (12 mi) southwest of Mbandaka . On 8 June 1883 the explorer Henry Morton Stanley passed by the Ikengo villages, Ikengo, Itumbu and Inganda. He had been there before in 1877, and the people of each village asked him to come to their village and promised food, beer and wine. One of
86-633: A number of active and dormant volcanoes, among them: Mount Kilimanjaro , Mount Kenya , Mount Longonot , Menengai Crater, Mount Karisimbi , Mount Nyiragongo , Mount Meru and Mount Elgon , as well as the Crater Highlands in Tanzania. Although most of these mountains lie outside of the rift valley, the EAR created them. Notable active examples of EAR volcanism include Erta Ale , Dalaffilla (also called Gabuli, Alu-Dalafilla), and Ol Doinyo Lengai . Erta Ale
129-427: A proposal to expand generation through improvements and the construction of a new hydroelectric dam . The project would bring the maximum output of the facility to 40,000 megawatts (MW). It is feared that these new hydroelectric dams could lead to the extinction of many of the fish species that are native to the river. East African Rift The East African Rift ( EAR ) or East African Rift System ( EARS )
172-779: Is a basaltic shield volcano in the Afar Region of northeastern Ethiopia, active continuously since at least 1967, with a summit lava lake documented since at least 1906. The 2008 eruption of Dalafilla, its only documented activity since the start of the Holocene , is the largest recorded eruption in Ethiopian history. Ol Doinyo Lengai is currently the only active natrocarbonatite volcano on Earth. Its magma contains almost no silica; typical lava flows have viscosities of less than 100 Pa⋅s, comparable to olive oil at 26 °C (79 °F). EAR-related volcanic structures with dated activity since
215-570: Is an active continental rift zone in East Africa . The EAR began developing around the onset of the Miocene , 22–25 million years ago. It was formerly considered to be part of a larger Great Rift Valley that extended north to Asia Minor . A narrow zone, the rift is a developing divergent tectonic plate boundary where the African plate is in the process of splitting into two tectonic plates, called
258-479: Is constructive to test hypotheses on computer based geodynamical models. A 3D numerical geodynamic model of the plume-crust coupling was capable of reproducing the lateral asymmetry of the EAR around the Tanzania craton . Numerical modeling of plume-induced continental break-up shows two distinct stages, crustal rifting followed by lithospheric breakup, and the upwelling between stages of an upper mantle plume. Prior to
301-3938: Is in the Ruwenzori Mountains , at an altitude of around 4,340 m (14,240 ft) above sea level. Distribution of the Congo basin area between countries: The most important hydrological stations along the Congo River are: Brazzaville The Congo River discharge at Kinshasa / Brazzaville stations since the start of measurements (1902 to 2021): 5°08′30.4″S 13°59′27.9″E / 5.141778°S 13.991083°E / -5.141778; 13.991083 5°02′57.3″S 13°59′28.2″E / 5.049250°S 13.991167°E / -5.049250; 13.991167 5°01′49.5″S 14°01′37.2″E / 5.030417°S 14.027000°E / -5.030417; 14.027000 5°2′20.6″S 14°02′09.2″E / 5.039056°S 14.035889°E / -5.039056; 14.035889 4°56′50.7″S 14°09′21.2″E / 4.947417°S 14.155889°E / -4.947417; 14.155889 4°55′38.5″S 14°15′16.5″E / 4.927361°S 14.254583°E / -4.927361; 14.254583 4°54′03.3″S 14°24′18.2″E / 4.900917°S 14.405056°E / -4.900917; 14.405056 Brazzaville 4°16′47.3″S 15°18′32.8″E / 4.279806°S 15.309111°E / -4.279806; 15.309111 4°05′24.4″S 15°30′39.1″E / 4.090111°S 15.510861°E / -4.090111; 15.510861 3°52′43.4″S 15°55′11.6″E / 3.878722°S 15.919889°E / -3.878722; 15.919889 3°33′18.7″S 16°05′32.2″E / 3.555194°S 16.092278°E / -3.555194; 16.092278 3°28′52.5″S 16°07′18.3″E / 3.481250°S 16.121750°E / -3.481250; 16.121750 3°11′23.7″S 16°11′09.6″E / 3.189917°S 16.186000°E / -3.189917; 16.186000 3°10′36.4″S 16°11′41.5″E / 3.176778°S 16.194861°E / -3.176778; 16.194861 3°09′59.7″S 16°10′51.7″E / 3.166583°S 16.181028°E / -3.166583; 16.181028 2°48′33.9″S 16°11′40.1″E / 2.809417°S 16.194472°E / -2.809417; 16.194472 2°12′22.9″S 16°10′49.0″E / 2.206361°S 16.180278°E / -2.206361; 16.180278 2°09′28.5″S 16°12′16.5″E / 2.157917°S 16.204583°E / -2.157917; 16.204583 1°52′15.5″S 16°30′43.4″E / 1.870972°S 16.512056°E / -1.870972; 16.512056 1°37′55.5″S 16°37′59.4″E / 1.632083°S 16.633167°E / -1.632083; 16.633167 1°14′22.2″S 16°47′44.5″E / 1.239500°S 16.795694°E / -1.239500; 16.795694 1°03′13.5″S 17°08′58.0″E / 1.053750°S 17.149444°E / -1.053750; 17.149444 0°54′39.2″S 17°23′27.1″E / 0.910889°S 17.390861°E / -0.910889; 17.390861 0°43′38.5″S 17°33′02.9″E / 0.727361°S 17.550806°E / -0.727361; 17.550806 0°41′00.4″S 17°36′43.7″E / 0.683444°S 17.612139°E / -0.683444; 17.612139 0°25′58.1″S 17°50′13.3″E / 0.432806°S 17.837028°E / -0.432806; 17.837028 0°01′17.4″N 18°13′10.9″E / 0.021500°N 18.219694°E / 0.021500; 18.219694 0°30′22.1″N 25°11′03.4″E / 0.506139°N 25.184278°E / 0.506139; 25.184278 The main river and tributaries are (sorted in order from
344-519: Is the preferred English name in 19th-century literature, although references to Zahir or Zaire as the name used by the inhabitants remained common. The Democratic Republic of the Congo and the Republic of the Congo are named after it, as was the previous Republic of the Congo which had gained independence in 1960 from the Belgian Congo . The Republic of Zaire during 1971–1997 was also named after
387-661: The Atlantic Ocean and an additional 6% of bedload . The river and its tributaries flow through the Congo rainforest , the second largest rainforest area in the world, after the Amazon rainforest in South America. The river also has the second-largest flow in the world, behind the Amazon ; the second-largest drainage basin of any river, behind the Amazon; and is one of the deepest rivers in
430-542: The Ethiopian Highlands and the Kenya Highlands are hotspots of higher rainfall amid the semi-arid to arid lowlands of East Africa. Lakes which form within the rift, including Lake Victoria , have a large effect on regional climate. They are a source of water vapour, and also lead to the formation of lake breeze systems , which affect weather across large areas of East Africa. The east to west river valleys within
473-560: The Inga dams , about 200 kilometres (120 mi) southwest of Kinshasa. The project was launched in the early 1970s, when the first dam was completed. The plan (as originally conceived) called for the construction of five dams that would have had a total generating capacity of 34,500 megawatts (MW). To date only the Inga I and Inga II dams have been built, generating 1,776 MW. In February 2005, South Africa 's state-owned power company, Eskom , announced
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#1732948259253516-626: The Main Ethiopian Rift , runs southward from the Afar triple junction, and continues south as the Kenyan Rift Valley, then transects Congo DR , Uganda , Rwanda , Burundi , Zambia , Tanzania , Malawi and Mozambique . The Western Rift Valley includes the Albertine Rift , and farther south, the valley of Lake Malawi . The rift also continues offshore from the coast of Mozambique along
559-627: The Oligocene , with the majority of the volcanism coinciding with the opening of the Red Sea and the Gulf of Aden approximately 30 Ma. The composition of the volcanics are a continuum of ultra-alkaline to tholeiitic and felsic rocks. It has been suggested that the diversity of the compositions could be partially explained by different mantle source regions. The EAR also cuts through old sedimentary rocks deposited in ancient basins. The East African Rift Zone includes
602-560: The Pool Malebo (Stanley Pool). Kinshasa (formerly Léopoldville) and Brazzaville are on opposite sides of the river at the Pool, where the river narrows and falls through a number of cataracts in deep canyons (collectively known as the Livingstone Falls ), running by Matadi and Boma , and into the sea at Muanda . Lower Congo constitutes the "lower" parts of the great river; that is
645-674: The Somali plate and the Nubian plate , at a rate of 6–7 mm (0.24–0.28 in) per year. The rift system consists of three microplates, the Victoria microplate to the north, and the Rovuma and Lwandle microplates to the south. The Victoria microplate is rotating anti-clockwise with respect to the African plate. Its rotation is caused by the configuration of mechanically weaker and stronger lithospheric regions in
688-506: The Uíge Province in Angola to the confluence with the Congo at Zongo some 80 km (50 mi) downstream from the twin capitals. Because of the vast number of rapids, in particular the Livingstone Falls , this section of the river is not operated continuously by riverboats. The Congo basin covers ten countries and accounts for about 13% of Africa . The highest point in the Congo basin
731-399: The lithosphere in saturated areas, making the thinning lithosphere behave like a mid-ocean ridge . According to marine geologist Kathleen Crane , the rift could eventually cause eastern Africa to separate from the mainland, although this potential event could take tens of millions of years. Studies that contribute to the broader understanding on the evolution of rifts can be grouped into
774-520: The Atlantic Ocean. Opportunities for the Congo River and its tributaries to generate hydropower are therefore enormous. Scientists have calculated that the entire Congo Basin accounts for 13 percent of global hydropower potential. This would provide sufficient power for all of Sub-Saharan Africa 's electricity needs. Currently, there are about 40 hydropower plants in the Congo Basin. The largest are
817-624: The Congo below Boyoma Falls . The Chambeshi River in Zambia is generally taken as the source of the Congo in line with the accepted practice worldwide of using the longest tributary, as with the Nile River. The Congo flows generally toward the northwest from Kisangani just below the Boyoma Falls, then gradually bends southwestward, passing by Mbandaka , joining with the Ubangi River and running into
860-404: The EAR. The results corroborate the coexistence of a superplume "common to the entire rift" with another mantle material source being either of subcontinental type or of mid-ocean ridge type. The geophysical method of seismic tomography is a suitable tool to investigate Earth's subsurface structures deeper than the crust. It is an inverse problem technique that models which are the velocities of
903-896: The EARS. Many of the African Great Lakes lie within the Rift Valley. A series of distinct rift basins, the East African Rift System extends over thousands of kilometers. North of the Afar triple junction, the rift follows two paths: west to the Red Sea Rift and east to the Aden Ridge in the Gulf of Aden . Southward from the Afar triple junction , the EAR consists of two main branches. The Eastern Rift Valley (also known as Gregory Rift ) includes
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#1732948259253946-585: The Kerimba and Lacerda grabens , which are joined by the Davie Ridge, a 2,200 km-long (1,400 mi) relic fracture zone that cuts across the West Somali basin, straddling the boundary between Tanzania and Mozambique. The Davie Ridge ranges between 30–120 km (19–75 mi) wide, with a west-facing scarp (east-plunging arch) along the southern half of its length that rises to 2,300 m (7,500 ft) above
989-498: The Kongo people or Bakongo was introduced in the early 20th century. The name Zaire is from a Portuguese adaptation of a Kikongo word, nzere ("river"), a truncation of nzadi o nzere ("river swallowing rivers"). The river was known as Zaire during the 16th and 17th centuries; Congo seems to have replaced Zaire gradually in English usage during the 18th century, and Congo
1032-570: The Lualaba, the main tributary, the Congo River has a total length of 4,370 km (2,720 mi). It is the only major river to cross the Equator twice. The Congo Basin has a total area of about 4,000,000 km (1,500,000 sq mi), or 13% of the entire African landmass. The name Congo/Kongo originates from the Kingdom of Kongo once located on the southern bank of the river. The kingdom in turn
1075-595: The Somali Jet) in the western Indian Ocean . The Somali Jet supplies water vapour for the high rainfall during the Indian Monsoon and is responsible for roughly half the global cross-equatorial atmospheric mass flux in the lower-branch of Hadley Circulation . The Rift Valley in East Africa has been a rich source of hominid fossils that allow the study of human evolution. The rapidly eroding highlands quickly filled
1118-606: The development of deep asymmetric basins. The second stage of rifting was characterized by the deactivation of large boundary faults, the development of internal fault segments, and the concentration of magmatic activity towards the rifts. Today, the narrow rift segments of the East African Rift system form zones of localized strain. These rifts are the result of the actions of numerous normal faults which are typical of all tectonic rift zones. As aforementioned, voluminous magmatism and continental flood basalts characterize some of
1161-563: The effects of deep-rooted mantle plumes are an important hypothesis, their location and dynamics are poorly understood, and a matter of active research. The question is still debated. The most recent and accepted view is the theory put forth in 2009: that magmatism and plate tectonics have a feedback with one another, controlled by oblique rifting conditions. According to this theory, lithospheric thinning generates volcanic activity, further increasing magmatic processes such as intrusions and numerous small plumes. These processes further thin
1204-405: The inner Earth that reproduce the seismographic data recorded all around the world. Recent improvements of tomographic Earth models of P wave and S wave velocities suggest that a superplume upwelling from the lower mantle at the northeastern EAR feeds plumes of smaller scale into the upper mantle . Parallel to geological and geophysical measures (e.g. isotope ratios and seismic velocities) it
1247-520: The main health problems in Ikengo is the lack of clean water, leading to illnesses such as diarrhea. Malaria and acute respiratory infections are also common. In 2021 the United Nations Development Programme (UNDP) handed over a health center in Ikengo to the local authorities. It was receiving about 20 patients per day. Due to its accessibility by canoe it served several nearby health zones. Congo River Measured along with
1290-597: The mouth heading upstream): Lower Congo (river mouth to Kinshasa ) Downstream of Kinshasa, from the river mouth at Banana , there are a few major tributaries. Middle Congo ( Kinshasa to the Boyoma Falls ) Upper Congo ( Lualaba ; upstream from the Boyoma Falls ) Although the Livingstone Falls prevent access from the sea, nearly the entire Congo above them is readily navigable in sections, especially between Kinshasa and Kisangani. Large river steamers worked
1333-650: The onset of the Holocene include approximately 50 in Ethiopia, 17 in Kenya , and 9 in Tanzania . The EAR is the largest seismically active rift system on Earth today. The majority of earthquakes occur near the Afar Depression, with the largest typically occurring along or near major border faults. Seismic events in the past century are estimated to have reached a maximum moment magnitude of 7.0. The seismicity trends parallel to
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1376-724: The rift segments, while other segments, such as the Western branch, have only very small volumes of volcanic rock. The African continental crust is generally cool and strong. Many cratons are found throughout the EAR, such as the Tanzania and Kaapvaal cratons . The cratons are thick, and have survived for billions of years with little tectonic activity. They are characterized by greenstone belts , tonalites , and other high-grade metamorphic lithologies. The cratons are of significant importance in terms of mineral resources , with major deposits of gold, antimony, iron, chromium and nickel. A large volume of continental flood basalts erupted during
1419-673: The rift system, including the Turkana Channel in northern Kenya and the Zambezi river valley, concentrate low-level easterly winds and accelerate them towards Central Africa . This leaves East Africa drier than it otherwise would be, and also supports the high rainfall in the Congo Basin rainforest . The formation of the east–west valleys could in turn be important for the aridification of East Africa over millions of years. The barrier presented by EARS concentrates monsoonal winds (known as
1462-451: The rift system, with a shallow focal depth of 12–15 km (7.5–9.3 mi) beneath the rift axis. Further away from the rift axis, focal depths can be below 30 km (19 mi). Focal mechanism solutions strike NE and frequently demonstrate normal dip-slip faulting, although left-lateral motion is also observed. The East African Rift system affects regional, continental and even global climate. Regions of higher elevation, including
1505-515: The rift's formation, enormous continental flood basalts erupted, uplifting the Ethiopian , Somali, and East African plateaus. The first stage of rifting of the EAR was characterized by rift localization and magmatism along the entire rift zone. Periods of extension alternated with relative inactivity. There was also the reactivation of a pre-Cambrian weakness in the crust, a suture zone of multiple cratons , displacement along large boundary faults, and
1548-506: The river until quite recently. The Congo River still is a lifeline in a land with few roads or railways. Railways now bypass the three major falls, and much of the trade of Central Africa passes along the river, including copper , palm oil (as kernels), sugar , coffee , and cotton . The Congo River is the most powerful river in Africa. During the rainy season over 50,000 cubic metres (1,800,000 cu ft) of water per second flows into
1591-552: The river's name in French and Portuguese . The Congo's drainage basin covers 4,014,500 km (1,550,000 sq mi), an area nearly equal to that of the European Union . The Congo's discharge at its mouth ranges from 23,000 to 75,000 m /s (810,000 to 2,650,000 cu ft/s), with an average of 41,000 m /s (1,400,000 cu ft/s). The river transports annually 86 million tonnes of suspended sediment to
1634-432: The sea floor. Its movement is concurrent with the EAR. Over time, many theories have tried to clarify the evolution of the East African Rift. In 1972 it was proposed that the EAR was not caused by tectonic activity, but rather by differences in crustal density. Since the 1990s, evidence has been found in favor of mantle plumes beneath the EAR. Others proposed an African superplume causing mantle deformation. Although
1677-576: The section of the river from the river mouth at the Atlantic coast to the twin capitals of Brazzaville and Kinshasa. In this section of the river, there are two significant tributaries, both on the left or south side. The Kwilu River originates in the hills near the Angolan border and enters the Congo some 100 km upstream from Matadi . The other is the Inkisi River , that flows in a northerly direction from
1720-410: The techniques of isotope geochemistry, seismic tomography and geodynamical modeling. The varying geochemical signatures of a suite of Ethiopian lavas suggest multiple plume sources: at least one of deep mantle origin, and one from within the subcontinental lithosphere. In accordance, a 2014 study compares the geochemical signature of rare earth isotopes from xenoliths and lava samples collected in
1763-455: The valley with sediments, creating a favorable environment for the preservation of remains. The bones of several hominid ancestors of modern humans have been found here, including those of " Lucy ", a partial australopithecine skeleton discovered by anthropologist Donald Johanson dating back over 3 million years. Richard and Mary Leakey have also done significant work in this region. In 2008, two other hominid ancestors were discovered here:
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1806-546: The world, at depths greater than 220 m (720 ft). Because its drainage basin includes areas both north and south of the Equator , its flow is stable, as there is always at least one part of the river experiencing a rainy season . The sources of the Congo are in the highlands and mountains of the East African Rift , as well as Lake Tanganyika and Lake Mweru , which feed the Lualaba River , which then becomes
1849-513: Was named after the indigenous Bantu Kongo people , known in the 17th century as "Esikongo". South of the Kingdom of Kongo proper lay the similarly named Kakongo kingdom, mentioned in 1535. Abraham Ortelius labelled "Manicongo" as the city at the mouth of the river in his world map of 1564. The tribal names in Kongo possibly derive from a word for a public gathering or tribal assembly. The modern name of
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