| Answer | % Correct |
|---|---|
| Rhine | 96%
|
| Ruhr | 88%
|
| Wupper | 85%
|
| Düssel | 81%
|
| Ems | 75%
|
| Sieg | 75%
|
| Maas | 71%
|
| Lippe | 69%
|
| Ijssel | 67%
|
| Erft | 65%
|
| Weser | 63%
|
| Rur | 50%
|
| Emscher | 50%
|
| Möhne | 38%
|
| Lenne | 35%
|
| Niers | 35%
|
| Diemel | 31%
|
| Bigge | 25%
|
| Emmer | 25%
|
| Vechte | 19%
|