100 Fun Facts About River

Which two rivers are locked in a long-running dispute over the title of world's longest?

The Nile is traditionally listed at about 6,650 km, but some scientists measure the Amazon as longer if you count it to the Pará estuary.

Which river did Julius Caesar cross with his army, giving us the phrase for passing the point of no return?

Roman law barred a general from leading troops into Italy, so crossing the Rubicon made Caesar an outlaw and started a civil war.

By discharge volume, which river is by far the largest in the world?

No bridge crosses the Amazon's main channel: it runs mostly through rainforest with very few roads or cities, so people cross by ferry.

Florence's Ponte Vecchio was the city's only bridge to survive World War II; which river does it cross?

The Ponte Vecchio over the Arno is famous for the row of shops built along both its sides.

Which Spanish explorer navigated and named South America's greatest river in 1542?

Francisco de Orellana joined Gonzalo Pizarro's search for the rumoured Land of Cinnamon, and ended up sailing the river all the way to the Atlantic.

What is the pororoca?

The pororoca is a tidal bore on the Amazon, where incoming ocean tides push waves up to 4 metres high upriver.

In which direction does the Nile flow?

The Nile flows north into the Mediterranean, which is why Upper Egypt, upstream, lies in the south and Lower Egypt in the north.

In which city do the White Nile and Blue Nile meet?

Khartoum sits where the two rivers join, and the Blue Nile, rising at Lake Tana in Ethiopia, supplies most of the water that reaches Egypt.

What is the name of the huge reservoir created by Egypt's Aswan High Dam?

Lake Nasser's rising waters threatened the temples of Abu Simbel, so they were taken apart and rebuilt on higher ground.

Which icy river did George Washington's army cross on Christmas night before surprising Hessian troops at Trenton?

Washington's army crossed the Delaware in sleet and snow, and the victory at Trenton revived the Continental Army's collapsing morale.

According to the Gospels, in which river did John the Baptist baptize Jesus?

The Jordan never reaches the sea: it ends in the Dead Sea, a salt lake with no outlet more than 400 metres below sea level.

Which capital's name combines two towns that face each other across the Danube?

Budapest was created in 1873 by uniting hilly Buda and Óbuda on the Danube's west bank with flat Pest on the east.

In which German region does the Danube rise?

Not far from its Black Forest springs, the Danube sinks into its own riverbed near Immendingen, and on many summer days it disappears completely.

Which European capital stands on the Vltava River?

Prague's river inspired Bedřich Smetana's symphonic poem Vltava, known in English as The Moldau.

Which river is the longest in Europe?

The Volga runs about 3,530 km through Russia, and Russian literature and folklore call it Mother Volga.

Into which body of water does Europe's longest river empty?

The Caspian Sea is conventionally counted as the world's largest lake, even though it is called a sea.

What is the traditional source of the Mississippi River?

Explorer Henry Schoolcraft coined the name of Lake Itasca, Minnesota, from the Latin veritas caput, meaning 'true head' of the river.

The name Mississippi comes from an Ojibwe phrase meaning what?

Misi-ziibi, the Ojibwe name for the river, means great river, and the state of Mississippi took its name from the river.

Lewis and Clark traveled up which river, the longest in the United States?

Measured from the Missouri's headwaters, the combined Mississippi system ranks as the fourth-longest river in the world.

Which river's 1969 fire in Cleveland helped spur the Clean Water Act and the creation of the EPA?

The Cuyahoga had caught fire more than a dozen times since 1868, but the 1969 blaze was the one that sparked national outrage.

What did engineers do to the Chicago River in 1900?

Engineers reversed its flow away from Lake Michigan, so Chicago's sewage headed toward the Mississippi instead of into the lake that held its drinking water.

Which river did Captain Sully land his US Airways jet on after birds knocked out both engines?

All 155 people aboard survived when Captain Chesley Sullenberger glided the plane onto the Hudson River beside Midtown Manhattan.

The Onyx, only 32 km long, is the longest river on which continent?

Antarctica's Onyx River is a summer meltwater stream that flows inland, away from the ocean, into Lake Vanda.

Which river carved the Grand Canyon?

So much of the Colorado River's water is diverted for farms and cities that it now rarely reaches the Gulf of California.

Which dam created Lake Mead on the river that carved the Grand Canyon?

Water rising behind Hoover Dam drowned the town of St. Thomas, Nevada, whose ruins resurfaced when Lake Mead dropped in the 2000s.

As of 2025, which river powers the world's largest hydroelectric power station?

The Yangtze's Three Gorges Dam, the biggest power station by installed capacity, flooded whole towns and archaeological sites when its reservoir filled.

Which Chinese waterway is nicknamed both 'China's Pride' and 'China's Sorrow' for its floods?

The Yellow River's 1887 flood killed an estimated 900,000 to 2 million people, among the deadliest natural disasters on record.

China's second-longest river gets its colour and name from silt from which upland region?

The Loess Plateau is built of loess, fine wind-blown dust, and the silt the river carries off it settles in its channel and causes floods.

Which river is the most sacred in Hinduism and is worshipped as a goddess?

The Ganges fell from heaven in Hindu myth, and Shiva caught the goddess in his matted hair so the force of her fall wouldn't destroy the earth.

Which river system forms the largest delta in the world?

The Ganges-Brahmaputra delta meets the sea in the Sundarbans, the world's largest mangrove forest and a home of the Bengal tiger.

Which river plunges over Victoria Falls, 'the smoke that thunders'?

The Zambezi's Kariba Dam, between Zambia and Zimbabwe, created Lake Kariba, one of the world's largest artificial lakes.

Which Scottish explorer descended southern Africa's great east-flowing river and named Victoria Falls?

The missionary David Livingstone was introduced to the falls in 1855 and named them after Queen Victoria.

Which river, rising in Wales, is longer than the Thames?

The Severn runs 354 km, making it the longest river in Great Britain, just ahead of the Thames at 346 km.

Which West African river gave its name to two countries?

The Niger flows through both Niger and Nigeria, and each country takes its name from the river.

By what name is the Thames known as it flows through Oxford?

Oxford's college rowing races, including the annual Eights Week regatta, are held on the Isis.

In which country does the Mekong reach the sea?

The Mekong empties into the South China Sea through the Mekong Delta in southern Vietnam, splitting into a network of distributaries.

When the Mekong floods, what happens to the Tonlé Sap river in Cambodia?

The Tonlé Sap is famous because its flow reverses in flood season, carrying fish eggs and larvae into Tonlé Sap Lake.

Which enormous fish, reaching about 3 metres and 300 kg, is the Mekong's most famous inhabitant?

The Mekong giant catfish has declined so drastically, through dams and overfishing, that it is now critically endangered.

Which river is the second-longest in Africa after the Nile?

The Congo is also known as the Zaire River, and the country of Zaire took its name from the river.

Roughly what share of all river water reaching the oceans does the Amazon carry?

About 20% of all river water entering the oceans comes from the Amazon, the largest river system on Earth by volume.

Which river, at 2,508 km, is the longest in Australia?

The Murray's tributaries include five of Australia's next six longest rivers, and their basin covers about a seventh of the continent.

Which river is the longest in France?

The Loire's central valley, lined with vineyards and châteaux, was added to UNESCO's World Heritage list in 2000.

Mosul, Samarra and Baghdad all stand on the banks of which river?

The Tigris is the eastern of Mesopotamia's two great rivers, and it joins the Euphrates in the Shatt al-Arab before reaching the Persian Gulf.

Which river holds Europe's most powerful waterfall and empties into the North Sea?

The Rhine Falls, on the Rhine in northern Switzerland, is Europe's most powerful waterfall and a popular tourist attraction.

Which river rises in Tibet and empties into the Arabian Sea near Karachi?

The Indus gave India its name, through the ancient Greek word for the river.

Which Canadian river flows from Great Slave Lake to the Arctic Ocean?

Explorer Alexander Mackenzie followed the river hoping to reach the Pacific, but in 1789 it took him to the Arctic Ocean instead.

By what name is the Rio Grande known in Mexico?

Mexicans call the river the Río Bravo del Norte, and it marks the border between Texas and northeastern Mexico.

Which river's basin is split roughly 65% in Venezuela and 35% in Colombia?

The Orinoco sheds part of its upper water through the Casiquiare, the world's largest natural canal linking two major river systems.

Which is the longest river flowing entirely within Russia?

The Lena flows north across Siberia and spreads into a large delta on the Laptev Sea, part of the Arctic Ocean.

Novosibirsk, the largest city in Siberia, stands on which river?

The Ob and its tributary the Irtysh form the world's seventh-longest river system, and Novosibirsk was founded where the Trans-Siberian Railway crosses the Ob.

Which African animal's name comes from ancient Greek words meaning 'river horse'?

Hippopotamus is a misleading name: the animal's closest living relatives are whales, dolphins and porpoises, not horses.

Which American author took his pen name from a riverboat call for water two fathoms deep?

Mark Twain, born Samuel Clemens, heard the cry while working as a steamboat pilot: two fathoms, or 12 feet, meant safe water.

Niagara Falls lies on a short river that carries water between which two Great Lakes?

Erie and Ontario are linked by the Niagara River, whose Horseshoe Falls is the most powerful waterfall in North America by flow rate.

Despite its name, New York's East River under the Brooklyn Bridge is really which kind of waterway?

A tidal strait is the right label because the East River is salt water open at both ends, linking Upper New York Bay to Long Island Sound.

In Greek myth, the infant Achilles was dipped by his heel into which river of the underworld?

Styx was so sacred that Zeus decreed the gods must swear their solemn oaths by its water, a reward for siding with him against the Titans.

Which country made the Whanganui the first river in the world with the legal rights of a person?

New Zealand passed the law in 2017, ending the longest-running litigation in its history: local Māori first petitioned Parliament over the river in the 1870s.

Which ocean predator is known to swim far up rivers, even reaching Illinois on the Mississippi?

Bull shark records reach Alton, Illinois, far up the Mississippi, yet it is not a true freshwater shark.

Which river flows through Paris around the Île de la Cité, the island where Notre-Dame stands?

Seine riverbanks in Paris, the Rive Gauche and Rive Droite, are a UNESCO World Heritage Site, and the river meets the English Channel at Le Havre.

Which West African country is a thin strip of land along both banks of the river it is named after?

The Gambia is the smallest country on mainland Africa, bounded by Senegal on every side except its short Atlantic coast.

Which Venezuelan waterfall is named after a US pilot whose plane bogged down above it in 1937?

Angel Falls honours Jimmie Angel, who spent 11 days walking back to civilization with three companions after his wheels sank into marshy ground.

Which Austrian composer wrote the waltz 'The Blue Danube', first performed by a Vienna men's choir?

Johann Strauss II wrote the music first; the words were added afterwards by the choral association's own poet, Joseph Weyl.

The real 'Bridge on the River Kwai', built by Allied prisoners in World War II, stands in which country?

Thailand renamed the stretch under the bridge the Khwae Yai in the 1960s; during the war it counted as part of the Mae Klong, so the film's title was a misnomer.

The white marble Taj Mahal stands on the right bank of which river at Agra in northern India?

Yamuna water once fed the Taj Mahal's gardens through a channel, and archaeologists think the river was built into the design as one of the rivers of Paradise.

The Blue Nile, which supplies most of the Nile's water in the rainy season, rises in which country?

Ethiopia's Lake Tana is the source, and the river delivers 80–86% of the main Nile's water when the rains peak from June to September.

Which French river gave its name to the 1916 battle that saw the bloodiest day in British Army history?

Somme fighting ran from July to November 1916 and saw the first use of the tank; on the opening day the British lost 19,240 men killed.

Schoolteacher Annie Edson Taylor was the first person to survive going over Niagara Falls inside what?

A barrel of oak and iron, padded with a mattress, carried her over on her 63rd birthday; a cat had been sent over in it two days earlier as a test.

Which term names a tidal river mouth, like the Thames below London, where fresh and salt water mix?

Estuary comes from the Latin aestus, meaning tide; the brackish mix makes these river mouths transition zones between river and sea life.

Which English word for a competitor comes from the Latin for someone who shares the same stream?

Rival comes from rivalis, 'of the same brook', built on rivus; neighbours drawing on one stream were natural competitors.

Which waterfall system on the Argentina–Brazil border sends half its flow into the Devil's Throat?

Iguazu Falls is the largest waterfall system in the world; in legend a deity sliced the river in a rage when the woman he wanted fled by canoe with her lover.

Buenos Aires and Montevideo face each other across which waterway, up to 220 km wide at its mouth?

Río de la Plata means 'River of Silver', and if it is counted as a river at all, it is the widest in the world.

Which African river never reaches the sea, instead fanning into a vast inland delta in Botswana?

Okavango water rises in the highlands of Angola and ends in the Kalahari Desert, where nearly all of it evaporates or is taken up by plants.

Which African river did Rudyard Kipling call 'great grey-green, greasy' in his Just So Stories?

Limpopo is where Kipling's Elephant's Child gets his trunk; the real river rises in South Africa and reaches the Indian Ocean through Mozambique.

The ancient city of Babylon stood on which river, the longest in West Asia?

Euphrates water was Babylon's undoing in the traditional account: Cyrus's troops diverted the river upstream and marched in along the lowered channel.

Mandalay stands on the east bank of which river, Myanmar's most important commercial waterway?

Irrawaddy is sometimes called 'The Road to Mandalay' after Rudyard Kipling's poem; it splits Myanmar from north to south and ends in a nine-armed delta.

Which river, called the 'Black Dragon River' in Chinese, forms a long stretch of the Russia–China border?

Amur counts as the world's tenth-longest river when its headstream the Argun is included, and its Chinese name, Heilong Jiang, also names a province.

Which river, frozen hard enough in winter to cross on foot, forms the western China–North Korea border?

Yalu skies were the Korean War's 'MiG Alley', where dogfights for air supremacy were fought against MiG-15 jets above the river's western valley.

Which river carries the outflow of the Great Lakes past Montreal and Quebec City to the North Atlantic?

St. Lawrence was first Jacques Cartier's name for a bay he reached on the saint's feast day in 1535; the name later spread to the whole river.

Which river, the longest in Alaska, was the main highway to the goldfields in the Klondike Gold Rush?

Yukon paddle-wheel riverboats kept running until the 1950s, when the Klondike Highway was finished; the river ends in the Bering Sea.

Which river flows past both Washington, D.C. and Mount Vernon, George Washington's Virginia estate?

Potomac water runs from the highlands of West Virginia to Chesapeake Bay, with Maryland on one bank and the two Virginias on the other.

Which river, flowing from Pittsburgh to Cairo, Illinois, once divided free states from slave states?

Ohio crossings meant freedom for thousands escaping slavery, many of them helped over the narrow stretches by the Underground Railroad.

Which river of the Pacific Northwest is named after the Boston trading ship that sailed into it in 1792?

Columbia Rediviva was Captain Robert Gray's fur-trading ship; the river he named for it pours more water into the eastern Pacific than any other.

The huge Itaipu Dam on the Brazil–Paraguay border spans which river, the second-longest in South America?

Paraná power from Itaipu is shared by the two countries; the dam takes its name from a nearby island that the Guarani called the 'sounding stone'.

Near which Brazilian city do the dark Rio Negro and sandy Solimões run side by side for 6 km unmixed?

Manaus tour boats visit the Meeting of Waters, where differences in temperature, speed and sediment keep the two currents apart.

The Madeira, Negro and Tapajós are all what in relation to South America's largest river?

Tributaries of this river number more than 1,100, and the Madeira, the biggest of them, supplies about 15% of all the water it gathers.

The boto, the largest river dolphin, slowly turns which colour as its grey skin is scuffed with age?

Pink skin comes from repeated abrasion, and males end up pinker than females because they fight each other more often.

Which term describes fish such as salmon that live in the sea but swim up rivers to spawn?

Anadromous joins the Greek words for 'up' and 'course'; freshwater eels make the trip the other way round, breeding in salt water.

Which Arabic word names a desert riverbed that usually holds water only after heavy rain?

Wadi sediment can dam the bed and reroute the stream in the next flash flood, and desert nomads rely on the seasonal plants that grow there.

Which term, a 'watershed' in North America, names the land whose surface water all flows to one river mouth?

Drainage basin edges are ridges and hills known as the drainage divide, and that dividing line is what 'watershed' originally meant.

Which Greek thinker, known as 'the weeping philosopher', said no man ever steps in the same river twice?

Heraclitus saw the world as constantly in flux, always 'becoming' but never 'being'; another of his sayings was simply 'Everything flows'.

Which British army officer became the first European to see Lake Victoria and claimed it as the Nile's source?

John Hanning Speke died from a gunshot wound while out shooting, the afternoon before he was due to debate his claim in public at Bath.

Which river, the longest in South Africa, rises in Lesotho's Drakensberg and flows west to the Atlantic?

Orange honours the Dutch ruling family, the House of Orange, rather than the colour; the explorer Robert Jacob Gordon chose the name.

Which river was colonial Bogotá's only transport link to the Caribbean port of Cartagena de Indias?

Magdalena was the name Rodrigo de Bastidas gave the river on reaching it in 1501; conquistadors then used it to push into the mountainous interior.

What name is given to the six shallow, boulder-strewn stretches of the Nile upstream of Aswan?

Cataracts normally stop boats because the water is so shallow, yet some of them become navigable when the river is in flood.

Which structure of stepped pools lets migrating salmon climb past a dam on their way upstream?

Fish ladder steps are low weirs with resting pools between them; rough versions built from bundles of branches were reported in 17th-century France.

Which word for a flood bank, from the French for 'to raise', was first recorded in New Orleans?

Levee failures can be catastrophic, as Greater New Orleans learned in 2005 when its flood banks gave way during Hurricane Katrina.

Which South American region, the world's largest tropical wetland, drains slowly through the Paraguay River?

Pantanal floodplains are roughly 80% under water in the rainy season, and most of the region lies in Brazil's Mato Grosso do Sul.

Which river-bank classic about Mole, Ratty and Badger began as bedtime stories Kenneth Grahame told his son?

The Wind in the Willows also drew on letters about Toad that Grahame sent his son Alastair while away on boating holidays.

South Korea's rapid rise after the Korean War is called the 'Miracle' on which river through Seoul?

Han water runs more than a kilometre wide through Seoul; the boom it names made South Korea an economic model for other developing countries.

Which river, known as the Chikuma in its upper reaches, is the longest in Japan and ends at Niigata?

Shinano is the river's name only in Niigata Prefecture: upstream in Nagano, the old Shinano Province, it is called the Chikuma for more than half its length.

Which Southeast Asian capital was founded on the Chao Phraya River's east bank as a shield against Burmese invasions?

Bangkok took that form in 1782, though a village had stood on the river's opposite bank since at least the early 15th century.