Measured along with the Lualaba, the main tributary, the Congo River has a total length of Template:Cvt. It is the only major river to cross the equator twice.[2] The Congo Basin has a total area of about Template:Cvt, 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 was named after the indigenous Bantu Kongo people, known in the 17th century as "Esikongo".[3] 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.Template:Efn The tribal names in Kongo possibly derive from a word for a public gathering or tribal assembly. The modern name of the Kongo people or Bakongo was introduced in the early 20th century.Script error: No such module "Unsubst".
The name Zaire is from a Portuguese adaptation of a Kikongo word, Script error: No such module "Lang". ("river"), a truncation of Script error: No such module "Lang". ("river swallowing rivers").Template:Sfn 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 is the preferred English name in 19th-century literature, although references to Zahir or Zaire as the name used by the inhabitants remained common.[4] 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 the river's name in French and Portuguese.
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 third-largest river in the world by discharge volume (at mouth 41,860 m3/s), following the Amazon (219,530 m3/s) and Ganges–Brahmaputra–Meghna (total discharge at delta 43,950 m3/s) rivers;[7] the second-largest drainage basin of any river, behind the Amazon; and is one of the deepest rivers in the world, at depths greater than Template:Cvt.[1][8] 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.[9]
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 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 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 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 Angolanborder and enters the Congo some 100 km upstream from Matadi. The other is the Inkisi River, that flows in a northerly direction from the Uíge Province in Angola to the confluence with the Congo at Zongo some Script error: No such module "convert". 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 is in the Ruwenzori Mountains, at an altitude of around Template:Cvt above sea level.
Distribution of the Congo basin area between countries:[10]
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 the river until quite recently.Script error: No such module "Unsubst". The Congo River still is a lifeline in a land with few roads or railways.[24] 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.[25]
Hydroelectric power
The Congo River is the most powerful river in Africa. During the rainy season over Script error: No such module "convert". of water per second flows into 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.[26]
Currently, there are about 40 hydropower plants in the Congo Basin. The largest are the Inga dams, about Script error: No such module "convert". southwest of Kinshasa. The project was launched in the early 1970s, when the first dam was completed.[27] 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.[26]
In February 2005, South Africa's state-owned power company, Eskom, announced 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).[28] 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.[29]
The current course of the Congo River formed between 1.5 and 2 million years BP, during the Pleistocene.[30][31] It is likely that during this period many upper tributaries of the Congo were captured from adjacent river basins, including the Uele and upper Ubangi from the Chari system[32] and the Chambeshi River[33] alongside a number of upper Kasai River tributaries from the Zambezi system.[34]
In terms of aquatic life, the Congo River Basin has a very high species richness and among the highest known densities of endemics.[38] since 2009[update]Template:Dated maintenance category (articles)Script error: No such module "Check for unknown parameters"., almost 800 fish species have been recorded from the Congo River Basin (not counting Lake Tanganyika, which is connected but ecologically very different),[39] and large sections remain virtually unstudied.[40] For example, the section in Salonga National Park, which is about the size of Belgium, had still not been sampled at all in 2006.[41] New fish species are scientifically described with some regularity from the Congo River Basin, and many undescribed species are known.[42]
The Congo has by far the highest diversity of any African river system; in comparison, the next richest are the Niger, Volta and Nile with about 240, 140 and 130 fish species, respectively.[39][43] Because of the great ecological differences between the regions in the Congo basin—including habitats such as river rapids, deep rivers, swamps, and lakes—it is often divided into multiple ecoregions (instead of treating it as a single ecoregion). Among these ecoregions, the Livingstone Falls cataracts has more than 300 fish species,[44] including approximately 80 endemics[29] while the southwestern part (Kasai River basin) has more than 200 fish species, of which about a quarter are endemic.[45]
The dominant fish families—at least in parts of the river—are Cyprinidae (carp/cyprinids, such as Labeo simpsoni), Mormyridae (elephant fishes), Alestidae (African tetras), Mochokidae (squeaker catfishes), and Cichlidae (cichlids).[46] Among the natives in the river is the huge, highly carnivorous giant tigerfish. Three of the more unusual endemics are the whitish (non-pigmented) and blind Lamprologus lethops, which is believed to live as deep as Script error: No such module "convert". below the surface,[29]Heterochromis multidens, which is more closely related to cichlids of the Americas than other African cichlids,[47] and Caecobarbus geertsii, the only known cavefish in Central Africa.[48] There are also numerous endemic frogs and snails.[46][49] Several hydroelectric dams are planned on the river, and these may lead to the extinction of many of the endemics.[29]
The Democratic Republic of Congo (DRC) and Republic of Congo (RoC) have historically experienced recurrent flooding along the Congo River and its main tributaries during the rainy season, causing erosion and landslides, and negatively impacting human settlements, agriculture, and public health.[51][52] The Congo River is expected to be increasingly impacted by climate change as temperatures rise and rainfall increases both in intensity and seasonal duration.[52][53]
From October 2019 to January 2020, heavy rains affected 16 of the 26 provinces of the DRC and eight out of 12 departments of the RoC, leading to the 2019–2020 Congo River floods. The rains caused the overflow of the Congo River and Ubangi rivers, floods and landslides throughout the DRC and RoC and led to the displacement of hundreds of thousands of people.[54]
History
Pre-colonial history
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The entire Congo basin is populated by Bantu peoples, divided into several hundred ethnic groups. Bantu expansion is estimated to have reached the middle Congo by about 500 BC and the upper Congo by the first century AD. Remnants of the aboriginal population displaced by the Bantu migration, Pygmies/Abatwa of the Ubangian phylum, remain in the remote forest areas of the Congo Basin.
By the 13th century there were three main confederations of states in the western Congo Basin. In the east were the Seven Kingdoms of Kongo dia Nlaza, considered to be the oldest and most powerful, which likely included Nsundi, Mbata, Mpangu, and possibly Kundi and Okanga. South of these was Mpemba which stretched from modern-day Angola to the Congo River. It included various kingdoms such as Mpemba Kasi and Vunda. To its west across the Congo River was a confederation of three small states; Vungu (its leader), Kakongo, and Ngoyo.[55]Template:Rp
The Kingdom of Kongo was formed in the late 14th century from a merging of the kingdoms of Mpemba Kasi and Mbata Kingdom on the left banks of the lower Congo River. Its territorial control along the river remained limited to what corresponds to the modern Kongo Central province. European exploration of the Congo began in 1482 when Portuguese explorer Diogo Cão discovered the river estuaryTemplate:Sfn (likely in August 1482), which he marked by a Padrão, or stone pillar (still existing, but only in fragments) erected on Shark Point. Cão sailed up the river for a short distance, establishing contact with the Kingdom of Kongo. The full course of the river remained unknown throughout the early modern period.Template:Efn
The upper Congo basin runs west of the Albertine Rift.Template:Sfn Its connection to the Congo was unknown until 1877. The extreme northeast of the Congo basin was reached by the Nilotic expansion at some point between the 15th and 18th centuries, by the ancestors of the Southern Luo speaking Alur people. Francisco de Lacerda followed the Zambezi and reached the uppermost part of the Congo basin (the Kazembe in the upper Luapula basin) in 1796.
The upper Congo River was first reached by the Arab slave trade by the 19th century. Nyangwe was founded as a slavers' outpost around 1860. David Livingstone was the first European to reach Nyangwe in March 1871.Template:Sfn Livingstone proposed to prove that the Lualaba connected to the Nile, but on 15 July, he witnessed a massacre of about 400 Africans by Arab slavers in Nyangwe, which experience left him too horrified and shattered to continue his mission to find the sources of the Nile, so he turned back to Lake Tanganyika.[56][57]
Early European colonization
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The Europeans had not reached the central regions of the Congo basin from either the east or west, until Henry Morton Stanley's expedition of 1876–77, supported by the Committee for Studies of the Upper Congo. At the time one of the last open questions of the European exploration of Africa was whether the Lualaba River fed the Nile (Livingstone's theory), the Congo,Template:Sfn or even the Niger River. Financed in 1874, Stanley's first trans-Africa exploration started in Zanzibar and reached the Lualaba on October 17, 1876. Overland he reached Nyangwe, the center of a lawless area containing cannibal tribes at which Tippu Tip based his trade in slaves. Stanley managed to hire a force from Tippu Tip to guard him for the next Script error: No such module "convert". or so, for 90 days.
The party left Nyangwe overland through the dense Matimba forest. On November 19 they reached the Lualaba again. Since the going through the forest was so heavy, Tippu Tip turned around with his party on December 28, leaving Stanley on his own, with 143 people, including eight children and 16 women. They had 23 canoes. His first encounter with a local tribe was with the cannibal Wenya. In total Stanley reports 32 unfriendly meetings on the river, some violent, even though he attempted to negotiate a peaceful thoroughfare. But the tribes were wary as their only experience of outsiders was with slave traders.
On January 6, 1877, after Script error: No such module "convert"., they reached Boyoma Falls (called Stanley Falls for some time after), consisting of seven cataracts spanning Script error: No such module "convert". which they had to bypass overland. It took them to February 7 to reach the end of the falls. Here Stanley learned that the river was called Ikuta Yacongo,Template:Sfn proving to him that he had reached the Congo and that the Lualaba did not feed the Nile.
From this point, the tribes were no longer cannibalsScript error: No such module "Unsubst". but possessed firearms, apparently as a result of Portuguese influenceScript error: No such module "Unsubst".. Some four weeks and Script error: No such module "convert". later he reached Stanley Pool (now Pool Malebo), the site of the present day cities Kinshasa and Brazzaville. Further downstream were the Livingstone Falls, misnamed as Livingstone had never been on the Congo: a series of 32 falls and rapids with an elevation change of Script error: No such module "convert". over Script error: No such module "convert".. On 15 March they started the descent of the falls, which took five months and cost numerous lives. From the Isangile Falls, five falls from the foot, they beached the canoes and Lady Alice and left the river, aiming for the Portuguese outpost of Boma via land.
On August 3 they reached the hamlet Nsada. From there Stanley sent four men with letters forward to Boma, asking for food for his starving people. On August 7 relief came, being sent by representatives from the Liverpool trading firm Hatton & Cookson. On August 9 they reached Boma, 1,001 days since leaving Zanzibar on November 12, 1874. The party then consisted of 108 people, including three children born during the trip. Most probably (Stanley's own publications give inconsistent figures), he lost 132 people through disease, hunger, drowning, killing and desertion.Template:Sfn[58]
↑Script error: No such module "Footnotes".. "Not until it crosses the Equator will it at last turn away from this misleading course and, describing a remarkable counter-clockwise arc first to the west and then to the southwest, flow back across the Equator and on down to the Atlantic.
In this the Congo is exceptional. No other major river in the world crosses the Equator even once, let alone twice."
↑Thieme et al., Freshwater Ecoregions of Africa and Madagascar: A Conservation Assessment Ecoregions Assessments, Island Press, 2005, p. 297Template:Webarchive. "It is hypothesized that in the late Pliocene or early Pleistocene, a coastal Lower Guinean river captured Malebo Pool, connecting the previously interior Congo Basin to the ocean."
↑Cooper, John E. and Hull, Gordon; Gorilla Pathology and Health: With a Catalogue of Preserved Materials, p. 371 Template:ISBN
↑Skelton, P.H. 1994. 'Diversity and distribution of freshwater fishes in East and Southern Africa', in Biological diversity in African fresh and brackish water fishes, Symposium Paradi (G.G. Teugels, J.F. Guégan, and J.J. Albaret, editors), pp. 95–131. Annals of the Royal Central African Museum (Zoology) No. 275.
↑Gupta, Avijit (editor); Large Rivers: Geomorphology and Management, p. 327 Template:ISBN
↑Kullander, S.O. (1998). A phylogeny and classification of the South American Cichlidae (Teleostei: Perciformes). pp. 461–498 in Malabarba, L., et al. (eds.), Phylogeny and Classification of Neotropical Fishes, Porto Alegre.
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![Congo River Allegory by Thomas Vinçotte.[59]](/wiki143/index.php?title=File:Monument_aux_pionniers_belges_au_Congo_001.jpg){kind=link}