| Lenght | River | % Correct |
|---|---|---|
| 6650 km | Nile | 98%
|
| 4700 km | Congo | 94%
|
| 4200 km | Niger | 85%
|
| 2693 km | Zambezi | 80%
|
| 2092 km | Orange | 63%
|
| 1641 km | Senegal | 47%
|
| 1800 km | Limpopo | 42%
|
| 1600 km | Blue Nile | 41%
|
| 2270 km | Ubangi-Uele | 25%
|
| 2153 km | Kasai | 15%
|