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Largest River Basins in the Contiguous US
Based on this map: https://imgur.com/gallery/river-basins-of-us-rainbow-colours-fixed-updated-WaEbi
Only includes basins which empty into the sea, so no endorheic basins.
Area is in square miles, only including area within the United States.
Some area listings are estimates, as good data was hard to find in some cases.
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Last updated: September 28, 2025
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| First submitted | September 28, 2025 |
| Times taken | 14 |
| Average score | 44.4% | Report this quiz | Report |
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