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The World's Longest Rivers
You would think measuring a river would be simple. It is not. Where exactly does a river begin, among a thousand trickling headwater streams? Where does it end, when the mouth spreads into a tidal maze? Different answers give different lengths, which is why the title of "world's longest river" is one of geography's longest-running arguments.
The two contenders
By the traditional reckoning, the Nile in northeastern Africa is the longest, at roughly 6,650 kilometres, draining out of the highlands of East Africa and running north to the Mediterranean. Its rival is the Amazon in South America, at around 6,400 kilometres. Some expeditions, using a more distant source high in the Andes, have argued the Amazon is actually longer. What is not in dispute is volume: the Amazon carries more water than the next several rivers combined, by a wide margin.
The rest of the giants
After the top two comes the Yangtze, the longest river in Asia at about 6,300 kilometres, running across China to the East China Sea. Close behind is the Mississippi-Missouri system in North America, roughly 6,275 kilometres when the two are measured together. Siberia's Yenisei and Africa's Congo round out the conversation. All of these numbers should be read with an "about" in front of them, for the measurement reasons above.
Length is not the same as size
It is worth keeping two ideas apart. Length measures how far a river runs; discharge measures how much water it moves. The Amazon is only arguably the longest, but it is overwhelmingly the largest by discharge. A clue that says "the world's largest river" is usually pointing at the Amazon by volume, while "the longest" more often means the Nile. The wording matters.
Bottom Line
The Nile and the Amazon trade the crown for longest, followed by the Yangtze and the Mississippi-Missouri, with every figure carrying some uncertainty about where a river truly starts and ends. Remember that longest and largest are different questions, and river clues get a lot easier to place.
At a Glance
| Nile | ~6,650 km — Africa; traditionally the longest |
|---|---|
| Amazon | ~6,400 km — South America; largest by volume by far |
| Yangtze | ~6,300 km — the longest river in Asia (China) |
| Mississippi-Missouri | ~6,275 km — North America (measured together) |
| Longest vs largest | "Longest" usually means the Nile; "largest by volume" means the Amazon |
Frequently Asked Questions
What is the longest river in the world?
The Nile is traditionally considered the longest at about 6,650 kilometres, although some measurements argue the Amazon is longer. The exact ranking is disputed.
Why is the longest river disputed?
Rivers have many possible headwater sources and their mouths can spread into tidal deltas, so different choices of start and end points give different lengths for the Nile and the Amazon.
Which is the largest river by water volume?
The Amazon is by far the largest by discharge, carrying more water than the next several rivers combined.
What is the longest river in Asia?
The Yangtze in China is the longest river in Asia, at roughly 6,300 kilometres.