| km² | River Basin | mi² | % Correct |
|---|---|---|---|
| 3.7 mil | Congo | 1.4 mil | 100%
|
| 3.3 mil | Nile | 1.3 mil | 100%
|
| 2.3 mil | Niger | 873 k | 98%
|
| 1.3 mil | Zambezi | 515 k | 93%
|
| 941 k | Orange | 363 k | 89%
|
| 420 k | Senegal | 162 k | 86%
|
| 421 k | Limpopo | 163 k | 70%
|
| 407 k | Volta | 157 k | 70%
|
| 358 k | Okavango | 138 k | 47%
|
| 498 k | Jubba | 192 k | 28%
|
| 549 k | Chari | 212 k | 17%
|
| 337 k | Shebelle | 130 k | 16%
|