The commonly cited longest rivers are the Nile in Africa (6,650 km), Amazon in South America (6,436 km), Yangtze in Asia (6,300 km), Mississippi-Missouri system in North America (6,275 km), Volga in Europe (3,645 km), and Murray-Darling system in Oceania (about 2,740 km). These are approximate figures, and some count connected tributaries as one river system. Antarctica has no permanent river; its Onyx watercourse flows seasonally.
Longest river on each continent
The figures below use the CIA World Factbook’s 2023 archived list where available. Oceania and Antarctica are described separately because their reported figures use different definitions or describe a seasonal watercourse rather than a perennial river.
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| Continent | Commonly cited leader | Reported length | What the figure represents |
|---|---|---|---|
| Africa | Nile | 6,650 km | Length reported by the CIA World Factbook’s 2023 archived top-rivers list. |
| South America | Amazon | 6,436 km | Length reported by the CIA World Factbook’s 2023 archived top-rivers list. |
| Asia | Yangtze | 6,300 km | Length reported by the CIA World Factbook’s 2023 archived top-rivers list. |
| North America | Mississippi-Missouri | 6,275 km | Combined river-system figure reported by the CIA World Factbook’s 2023 archived top-rivers list, not the Mississippi main stem alone. |
| Europe | Volga | 3,645 km | Length reported by the CIA World Factbook’s 2023 archived top-rivers list. |
| Oceania | Murray-Darling system | Approximately 2,740 km | Geoscience Australia’s route includes the longest Darling tributaries: the Culgoa, Balonne and Condamine. |
| Antarctica | Onyx | About 32 km | A seasonal watercourse, not a permanent river; the cited account says it flows to a lake rather than the sea. |
The Onyx is an exception, not a comparable entry in a ranking of permanent rivers. Smart Water Magazine reports that Antarctica has no permanent rivers and describes the Onyx as a seasonal watercourse of about 32 km.
Why river-length rankings differ
There is no single measurement convention that every list follows. The U.S. Geological Survey says river lengths depend on measurement precision, map or aerial-photo scale, and choices about where a river begins and ends. Two common approaches are to measure from the mouth to the most distant headwater regardless of stream name, or to follow the headwaters of the stream commonly considered the source.
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Natural changes also affect the measured route. Channels shift, meanders can be cut off, sediment can build up, and coastal changes can alter a river mouth. The National Park Service describes a river-length measurement as a snapshot, not a timeless exact value.
For a meaningful comparison between lists, check the unit, whether the entry is a named river or a connected system, which headwater is counted, which mouth or endpoint is used, and the source’s date and method.
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- National Geographic Atlas of the World Eleventh Edition
River names and river systems are not interchangeable
The Mississippi-Missouri entry shows how the choice of label changes the number. The National Park Service reports the Mississippi itself at 2,350 miles, while the Missouri is about 100 miles longer. It gives 3,710 miles (5,970 km) for the combined Mississippi-Missouri system and notes that agencies report different lengths for the Mississippi main stem. The CIA’s 6,275 km entry is likewise a combined-system figure, so it should not be read as the Mississippi alone.
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Is the Nile longer than the Amazon?
The Nile is the conventional answer in the cited references, but the comparison depends on where the Amazon’s source is placed and which route is measured. The USGS lists the Nile at 4,132 miles and the Amazon at 4,000 miles. National Geographic gives approximately 6,650 km for the Nile and 6,437 km for the Amazon, while noting debate over the Amazon’s true beginning. Other choices of source or endpoint can change the comparison.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Length is different from water volume
A river’s length measures distance along its course; it does not measure how much water it carries. National Geographic describes the Amazon as the world’s largest river by volume. So the longest-river ranking and the largest-by-discharge distinction answer different questions.
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