Congo River
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50 free Congo River trivia questions with answers — geography quiz, new questions added Oct 2026.
The Congo is a river of extremes. It drains a vast bowl of forest and swamp in the middle of Africa, holds world records that surprise most people, and hides fish found nowhere else on Earth. This quiz collects the best fun facts about the Congo River: where it starts and ends, the rapids and pools along the way, the animals of its basin, the explorers and traders who travelled it, and the books, films and music it inspired. Every answer comes with a short explanation, so you learn the story behind the fact. It suits geography fans, students working on a river project, teachers who need a ready-made round, and anyone who likes a good did-you-know.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Which world record among rivers does the Congo River hold?
Deepest
Deepest of all rivers, the Congo has been measured at about 220 metres (720 feet), in gorges where the lower rapids squeeze the whole flow together.
Q 02What does the Congo River do that no other major river does, thanks to its great arc through Central Africa?
Crosses the Equator twice
Crosses the Equator twice: with land on both sides of the line, some part of the basin is always in a rainy season, which keeps the flow steady all year.
Q 03Which deadly virus, first identified in 1976, is named after a small river in the Congo River basin?
Ebola
Ebola was first identified at Yambuku, but a virologist named it after a river 111 km away so that the town would escape the stigma.
Q 04Which primate lives only south of the Congo River, a barrier that split it from the chimpanzee?
Bonobo
Bonobo and chimpanzee are both poor swimmers, so the river that formed between them over a million years ago may have split one ancestor into two species.
Q 05Which Joseph Conrad novella follows a steamboat captain sent up the Congo River for an ivory company?
Heart of Darkness
Heart of Darkness grew out of the author's own trip in 1890, when a Belgian trading company hired him to serve on one of its river steamers.
Q 06Which capital city stands directly across the Congo River from Kinshasa, within sight of the opposite bank?
Brazzaville
Brazzaville and Kinshasa are the only two national capitals in the world that grew up on opposite banks of one river within sight of each other.
Q 07Which Welsh-born journalist led the first expedition to follow the Congo River down to the sea, in 1877?
Henry Morton Stanley
Henry Morton Stanley later earned the local nickname Bula Matari, 'Breaker of Rocks', while building the first modern road along the river.
Q 08Which river, also flanked by rainforest, is the only one with a larger drainage basin than the Congo River?
Amazon
Amazon and Congo rank first and second for both basin size and rainforest area; the African basin alone is nearly as large as the European Union.
Q 09Which shy forest animal of the Congo Basin has zebra-striped legs but is the giraffe's closest living relative?
Okapi
Okapi sightings were so rare that Europeans in Africa spoke of an 'African unicorn'; science only formally recognised the species in 1901.
Q 10Which fruit shares its name with the small seaport on the north bank of the Congo River's mouth?
Banana
Banana sits on a creek sheltered from the ocean by a spit of land just 3 km long and no more than 400 metres wide.
Q 11Which river is the only one in Africa longer than the Congo River, which ranks second on the continent?
Nile
Nile waters travel farther, but the Congo carries far more of them: it is the most powerful river in Africa.
Q 12Into which ocean does the Congo River empty, at an average of about 41,000 cubic metres every second?
The Atlantic
The Atlantic takes in so much Congo water that the river also delivers about 86 million tonnes of suspended sediment to it every year.
Q 13In which country does the Chambeshi River, the most remote headstream of the Congo River, begin as a mountain stream?
Zambia
Zambia is where the Chambeshi feeds the Bangweulu Wetlands before its water continues north; counting it makes the whole river system about 4,700 km long.
Q 21Which huge Congo River predator has dagger-shaped teeth that slot into grooves along its jaws?
Goliath tigerfish
Goliath tigerfish can reach about 2 metres and 70 kg, which makes the species the largest member of its genus.
Q 22Which slow, plant-eating aquatic mammal lives in the lower reaches of the Congo River, near the sea?
Manatee
Manatee numbers in Africa are highest in a handful of places, the lower Congo among them, where river animals graze on plants overhanging the banks.
Q 23Which legendary creature of the Congo River basin is often described as a living sauropod dinosaur?
Mokele-mbembe
Mokele-mbembe has drawn many expeditions into the basin's swamps, yet searches and aerial surveys keep finding elephants and never a dinosaur.
Q 14What name does the upper Congo River carry above Boyoma Falls, before it officially becomes the Congo?
Lualaba
Lualaba is the name for some 1,800 km of the river, and 19th-century explorers argued over whether it fed the Congo or ran north towards Egypt.
Q 15Which chain of rapids below Kinshasa stops ships from sailing between the sea and the upper Congo River?
Livingstone Falls
Livingstone Falls honour a missionary explorer who never saw them; the river drops 270 metres here through a channel that is mostly under 800 metres wide.
Q 16Which Congo River city, the farthest point boats can reach upstream from Kinshasa, sits just below Boyoma Falls?
Kisangani
Kisangani lies about 2,100 km from the river's mouth and began as a small outpost known simply as Falls Station.
Q 17Which European monarch claimed the Congo Basin as his own private property in 1885, under the name Congo Free State?
Leopold II
Leopold II never once visited the territory he owned, and reports of deaths and abuse there forced him to hand it to the Belgian state in 1908.
Q 18What was built between Matadi and Kinshasa in the 1890s so that cargo could bypass the Congo River's rapids?
A railway
A railway 366 km long replaced the human porters who had carried every load around the falls, a journey that was often fatal.
Q 19Which 1974 heavyweight title fight was staged in Kinshasa, with the Congo River flowing past the city?
The Rumble in the Jungle
The Rumble in the Jungle saw Muhammad Ali beat George Foreman before a television audience that some estimates put at one billion people.
Q 20Which ruler renamed his country Zaire in 1971, reviving an old Portuguese name for the Congo River?
Mobutu Sese Seko
Mobutu Sese Seko renamed himself as well, taking a title that speaks of an all-powerful warrior who goes from conquest to conquest.
Q 24Which proposed dam scheme on the lower Congo River would generate almost double the power of China's Three Gorges?
Grand Inga
Grand Inga would harness a 96-metre drop in the river at Inga Falls, where two smaller dams already run, but the scheme has been delayed for years.
Q 25Which major tributary of the Congo River forms the border between the DRC and the Central African Republic?
Ubangi
Ubangi is the largest tributary on the Congo's right bank, about 2,270 km long when measured together with its headstream, the Uele.
Q 26Which southern tributary of the Congo River is known for the diamonds found along its course?
Kasai
Kasai water joins the main river northeast of Kinshasa, and its final stretch goes by a second name, the Kwa.
Q 27Which Portuguese navigator became the first European to reach the mouth of the Congo River, in 1482?
Diogo Cão
Diogo Cão marked the spot with a stone pillar bearing the Portuguese royal arms, one of several he carried aboard for the purpose.
Q 28Which 1884–85 gathering of European powers declared the Congo River free to shipping and its basin open to trade?
Berlin Conference
Berlin Conference invitations went to 13 European nations and the United States, but not to a single African country.
Q 29Which African Great Lake, the longest freshwater lake in the world, overflows into the Congo River through the Lukuga?
Tanganyika
Tanganyika's outflow through the Lukuga varies widely with the lake's level; explorers in the 1870s found the exit silted up behind a sandbar.
Q 30Which sense has the whitish Congo River cichlid Lamprologus lethops almost entirely lost by the time it is an adult?
Vision
Vision is little use to a fish thought to live as far as 160 metres down in fast water, so its eyes are sealed under a thick layer of skin.