| Answer | % Correct |
|---|---|
| Rhine | 96%
|
| Ruhr | 88%
|
| Wupper | 84%
|
| Düssel | 80%
|
| Ems | 75%
|
| Sieg | 75%
|
| Maas | 71%
|
| Lippe | 69%
|
| Ijssel | 67%
|
| Erft | 65%
|
| Weser | 63%
|
| Rur | 49%
|
| Emscher | 49%
|
| Möhne | 37%
|
| Lenne | 33%
|
| Niers | 33%
|
| Diemel | 29%
|
| Bigge | 24%
|
| Emmer | 24%
|
| Vechte | 18%
|