| Length (in Germany) (km) | Answer | % Correct |
|---|---|---|
| 727 | Elbe | 100%
|
| 865 | Rhine | 100%
|
| 527 | Main | 95%
|
| 647 | Danube | 89%
|
| 451 | Wesser | 63%
|
| 334 | Havel | 47%
|
| 382 | Spree | 47%
|
| 371 | Ems | 42%
|
| 362 | Neckar | 42%
|
| 413 | Saale | 32%
|