Major River Drainage Basins
The world's principal catchment areas ranked by surface area, spanning continental divides and global hydrologic cycles.
North America
Columbia River Basin
The Pacific Northwest's greatest hydroelectric and salmon migration corridor.
668,000 km²
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North America
Colorado River Basin
Lifeline of the American Southwest, draining seven states and carving the Grand Canyon.
640,000 km²
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Europe
Rhine Basin
Western Europe's busiest inland shipping artery connecting the Alps to the Port of Rotterdam.
185,000 km²
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