| Length (km) | River | % Correct |
|---|---|---|
| 6,650 | Nile | 98%
|
| 6,400 | Amazon | 96%
|
| 6,275 | Mississippi | 84%
|
| 5,464 | Yellow | 73%
|
| 6,300 | Yangtze | 68%
|
| 4,700 | Congo | 64%
|
| 4,350 | Mekong | 54%
|
| 4,200 | Niger | 49%
|
| 5,410 | Ob | 42%
|
| 4,400 | Lena | 35%
|
| 4,880 | Parana | 33%
|
| 3,672 | Murray | 32%
|
| 4,444 | Amur | 31%
|
| 4,241 | Mackenzie | 25%
|
| 5,539 | Yenisei | 25%
|