| Length (mi) | Answer | % Correct |
|---|---|---|
| 4,000 | Amazon | 100%
|
| 4,132 | Nile | 100%
|
| 3,710 | Mississippi | 95%
|
| 3,395 | Yellow | 84%
|
| 3,915 | Yangtze | 82%
|
| 2,900 | Congo | 79%
|
| 2,193 | Volga | 74%
|
| 2,700 | Mekong | 68%
|
| 2,600 | Niger | 63%
|
| 3,362 | Ob | 53%
|
| 2,734 | Lena | 45%
|
| 2,761 | Amur | 39%
|
| 3,032 | Parana | 37%
|
| 2,635 | Mackenzie | 26%
|
| 3,442 | Yenisey | 8%
|