| Length | River | % Correct |
|---|---|---|
| 4,180 mi. | Nile | 100%
|
| 3,912 mi. | Amazon | 97%
|
| 3,710 mi. | Mississippi-Missouri | 90%
|
| 2,900 mi. | Huang Ho | 78%
|
| 3,602 mi. | Chang Jiang | 73%
|
| 2,716 mi. | Zaire | 70%
|
| 3,459 mi. | Ob | 42%
|
| 2,795 mi. | Parana | 25%
|
| 2,800 mi. | Yenisei | 23%
|
| 2,758 mi. | Irtish | 2%
|