| km² | Bassin fluvial | % Correct |
|---|---|---|
| 3.3 mil | Nil | 100%
|
| 3.7 mil | Congo | 97%
|
| 2.3 mil | Niger | 91%
|
| 420 k | Sénégal | 74%
|
| 1.3 mil | Zambèze | 71%
|
| 941 k | Orange | 63%
|
| 358 k | Okavango | 31%
|
| 407 k | Volta | 29%
|
| 421 k | Limpopo | 20%
|
| 549 k | Chari | 17%
|
| 498 k | Jubba | 9%
|
| 337 k | Chébéli | 3%
|