List of drainage basins by area Basins Basins

| Basin | Continent | Drains_to | Basin_Area_km_2 | Basin_Area_mi_2 |
|---|---|---|---|---|
| Syr Darya | Asia | Aral Sea | 782669 | 302190 |
| Tigris - s Euphrates River | Asia | Persian Gulf | 765831 | 295689 |
| Tocantins River | South America | Atlantic Ocean | 764183 | 295053 |
| Okavango River / Okavango Delta | Africa | n/a ( endorheic basin ) | 721277 | 278487 |
| Rio Negro | South America | Amazon River | 720114 | 278038 |
| Colorado River (U.S.) | North America | Gulf of California | 703132 | 271481 |
| Kolyma River | Asia | Arctic Ocean | 679908 | 262514 |
| Columbia River | North America | Pacific Ocean | 657490 | 253858 |
| Brahmaputra River | Asia | Indian Ocean | 651334 | 251481 |
| Red Sea | multiple | Indian Ocean | 620000 | 230000 |
| São Francisco River | South America | Atlantic Ocean | 617812 | 238539 |
| Ubangi River | Africa | Congo River | 613202 | 236759 |