| Length | Answer | % Correct |
|---|---|---|
| 2,525 km | Ganges | 91%
|
| 6,300 km | Yangtze | 77%
|
| 5,464 km | Yellow | 73%
|
| 3,180 km | Indus | 64%
|
| 3,778 km | Mississippi | 52%
|
| 4,180 km | Niger | 30%
|
| 18 km | Buriganga | 5%
|
| 24 km | Sarno | 5%
|
| 270 km | Citarum | 2%
|
| n/a | Marilao | 2%
|