| Length/km | River | % Correct | |
|---|---|---|---|
| 6,695 | 1 | Nile | 99%
|
| 4,700 | 2 | Congo | 91%
|
| 4,200 | 3 | Niger | 86%
|
| 2,574 | 4 | Zambezi | 78%
|
| 2,092 | 7 | Orange River | 61%
|
| 1,800 | 8 | Limpopo | 40%
|
| 1,641 | 9 | Senegal | 38%
|
| 1,600 | 10 | Volta | 29%
|
| 2,270 | 5 | Ubangi–Uele | 17%
|
| 1,600 | 10 | Okavango | 13%
|
| 2,153 | 6 | Kasai | 8%
|