| Length (km) | Answer | % Correct |
|---|---|---|
| 6650 | Nile | 100%
|
| 6400 | Amazon River | 93%
|
| 6275 | Mississippi | 93%
|
| 4700 | Congo | 82%
|
| 6300 | Yangtze | 79%
|
| 5464 | Yellow River | 79%
|
| 5410 | Ob | 54%
|
| 4880 | Parana | 54%
|
| 4444 | Amur | 46%
|
| 5539 | Yenisey | 32%
|