How Many Rivers Are There in the World?

There are approximately 8.5 million river reaches mapped worldwide according to the HydroRIVERS database, the most comprehensive scientific dataset of global rivers. These rivers span a combined length of 35.9 million kilometers, enough to circle the Earth nearly 900 times.

Of these, roughly 246 rivers are longer than 1,000 km, and about 165 are classified as "major" named rivers. But the vast majority are smaller tributaries, streams, and waterways that feed into larger systems.

Despite their importance, rivers hold a surprisingly tiny fraction of Earth's water. All the world's rivers combined contain only about 2,120 km³ of water at any given time, just 0.006% of all freshwater on the planet. Most freshwater is locked in ice caps and glaciers (68.7%) or underground (30.1%). Yet rivers support an outsized share of life on Earth and are essential for agriculture, drinking water, transportation, and ecosystems.

Rivers by country

Counting rivers is difficult because there is no universal definition of what separates a "river" from a "stream" or "creek." The numbers below combine named river counts, waterway lengths from the CIA World Factbook, and estimates from national geographic surveys.

• 🇷🇺 Russia: ~120,000 rivers (>10 km), 2.3 million km total river length, 102,000 km navigable
• 🇺🇸 United States: ~250,000 rivers and streams, 5.6 million km total waterways (USGS), 41,009 km navigable
• 🇧🇷 Brazil: ~7,000+ named rivers, 50,000 km navigable, dominated by the Amazon basin
• 🇨🇳 China: ~50,000+ rivers, 1,500+ with catchments >1,000 km², 27,700 km navigable
• 🇨🇦 Canada: 184 major named rivers, vast network across 9.98 million km²
• 🇮🇳 India: 400+ named rivers, 14,500 km navigable, Ganges system dominant
• 🇮🇩 Indonesia: Thousands across 17,000+ islands, 21,579 km navigable
• 🇨🇴 Colombia: 158+ named rivers, 24,725 km navigable waterways
• 🇧🇩 Bangladesh: 700+ rivers, highest river density of any country, "Land of Rivers"
• 🇨🇩 DR Congo: Congo basin (2nd largest river basin), 15,000 km navigable
• 🇦🇷 Argentina: 128+ named rivers, 11,000 km navigable, Paraná-La Plata system
• 🇦🇺 Australia: 327+ named rivers, many intermittent/ephemeral in the Outback
• 🇯🇵 Japan: ~35,000 rivers and streams, mostly short and steep
• 🇩🇪 Germany: Hundreds of rivers, 7,467 km navigable (Rhine, Danube, Elbe)
• 🇫🇷 France: Hundreds of rivers, 8,501 km navigable (Loire, Seine, Rhône)
• 🇻🇳 Vietnam: Extensive network, 47,130 km navigable (3rd highest globally)
• 🇰🇿 Kazakhstan: 43,983 km navigable waterways (4th highest)
• 🇲🇲 Myanmar: 12,800 km navigable, Irrawaddy system
• 🇵🇪 Peru: Amazon headwaters, 8,808 km navigable
• 🇳🇬 Nigeria: 8,600 km navigable, Niger/Benue river system
• 🇷🇴 Romania: ~5,000+ rivers in the Danube basin
• 🇳🇵 Nepal: ~6,000+ streams draining the Himalayas
• 🇬🇧 UK: ~1,500+ named rivers, 3,200 km navigable (Thames, Severn)
• 🇲🇽 Mexico: 150+ named rivers, 2,900 km navigable
• 🇳🇿 New Zealand: 425,000 km of waterways, extremely dense river network
• 🇵🇰 Pakistan: 100+ named rivers, Indus river system
• 🇵🇱 Poland: Hundreds of rivers, 3,997 km navigable (Vistula, Oder)
• 🇸🇪 Sweden: Hundreds of rivers, 2,052 km navigable
• 🇹🇭 Thailand: Hundreds of rivers, 4,000 km navigable (Chao Phraya, Mekong)
• 🇫🇮 Finland: Hundreds of rivers, 8,000 km navigable, "Land of a Thousand Lakes"

The 10 longest rivers in the world

• Nile: 6,650 km (11 countries, Uganda to Egypt)
• Amazon: 6,400 km (Peru, Colombia, Brazil). Some measurements suggest it may be longer than the Nile at ~6,992 km.
• Yangtze: 6,300 km (China, longest in Asia)
• Mississippi-Missouri: 6,275 km (United States)
• Yenisei-Angara: 5,539 km (Mongolia, Russia)
• Yellow River (Huang He): 5,464 km (China)
• Ob-Irtysh: 5,410 km (China, Kazakhstan, Russia)
• Paraná (Río de la Plata): 4,880 km (Brazil, Paraguay, Argentina)
• Congo: 4,700 km (DR Congo, Republic of Congo, deepest river in the world)
• Amur: 4,444 km (Russia, China)

The 10 largest rivers by water volume

Measured by average discharge (cubic meters per second):

• Amazon: ~209,000 m³/s (20% of all river water entering the world's oceans)
• Congo: ~41,000 m³/s
• Ganges-Brahmaputra-Meghna: ~38,000 m³/s
• Orinoco: ~37,000 m³/s
• Yangtze: ~31,900 m³/s
• Río Negro: ~28,400 m³/s
• Paraná: ~25,700 m³/s
• Madeira: ~24,400 m³/s
• Yenisei: ~19,600 m³/s
• Lena: ~17,000 m³/s

How Many Rivers Cross International Borders?

Rivers do not respect political borders. There are 286 transboundary river and lake basins worldwide, spanning 153 countries and covering 45% of Earth's land surface. About 2.8 billion people (42% of the world's population) live in these shared basins, which produce roughly 54% of all global river discharge.

Managing transboundary waters is one of the most complex challenges in international relations. Disputes over shared rivers (the Nile between Egypt and Ethiopia, the Indus between India and Pakistan, the Mekong between China and Southeast Asia) have the potential to escalate into serious geopolitical conflicts.

How Polluted Are the Worlds Rivers?

The world's rivers face unprecedented pressure from human activity:

• Only 37% of the world's 246 longest rivers remain free-flowing (Nature, Grill et al., 2019). The rest are fragmented by dams, reservoirs, and other infrastructure.
• There are approximately 60,000 large dams worldwide, with over 3,700 additional hydropower dams planned or under construction.
• Only 21 of 91 rivers longer than 1,000 km that originally reached the ocean still flow uninterrupted from source to sea.
• Over 80% of global wastewater is discharged into rivers and waterways untreated (UN-Water).
• Approximately 1,000 rivers account for 80% of all plastic pollution entering the oceans (0.8-2.7 million metric tons per year).
• Freshwater species populations have declined 85% since 1970, far exceeding terrestrial (69%) and marine (56%) declines (WWF Living Planet Report 2024).
• Freshwater migratory fish populations declined 81% between 1970 and 2020, with Latin America/Caribbean seeing a 95% decline.

Rivers and Earth's freshwater

Rivers are a surprisingly small part of the global water cycle:

• Total water in all rivers: ~2,120 km³
• Share of Earth's freshwater: 0.006%
• Share of all water on Earth: 0.0001%
• For comparison: Ice caps and glaciers hold 26.35 million km³ (68.7% of freshwater), groundwater holds 10.53 million km³ (30.1%)
• The Amazon basin alone holds about 38% of the world's river water
• Despite their tiny share, rivers are the primary source of freshwater for most human civilizations

Are Rivers Disappearing?

Climate change, over-extraction, and deforestation are causing major rivers to shrink or dry up:

• The Amazon experienced record-low water levels in 2023-2024
• The Colorado River (USA) has lost 20% of its flow since 2000
• The Nile faces an estimated 25% flow decline due to deforestation and the Grand Ethiopian Renaissance Dam
• The Murray-Darling (Australia) has been severely reduced by drought and irrigation
• The Yellow River (China) ran completely dry for 226 days in 1997
• The Aral Sea (Central Asia) has lost 90% of its volume since the 1960s due to river diversion