| Area (km²) | River Basin | % Correct |
|---|---|---|
| 6,145,186 | Amazon River | 100%
|
| 3,202,185 | Mississippi-Missouri River | 99%
|
| 3,254,853 | Nile River | 99%
|
| 3,730,881 | Congo River | 96%
|
| 2,261,741 | Niger River | 91%
|
| 2,582,704 | Paraná River | 71%
|
| 2,982,493 | Ob River | 56%
|
| 1,929,955 | Amur River | 52%
|
| 2,306,743 | Lena River | 47%
|
| 2,554,388 | Yenisei River | 35%
|