| Length (mi) | Answer | % Correct |
|---|---|---|
| 4,000 | Amazon | 100%
|
| 4,132 | Nile | 100%
|
| 3,710 | Mississippi | 93%
|
| 3,915 | Yangtze | 83%
|
| 3,395 | Yellow | 81%
|
| 2,900 | Congo | 71%
|
| 2,193 | Volga | 67%
|
| 2,700 | Mekong | 62%
|
| 2,600 | Niger | 60%
|
| 3,362 | Ob | 48%
|
| 2,734 | Lena | 40%
|
| 2,761 | Amur | 36%
|
| 3,032 | Parana | 33%
|
| 2,635 | Mackenzie | 24%
|
| 3,442 | Yenisey | 7%
|