| Answer | % Correct |
|---|---|
| Rhine | 96%
|
| Ruhr | 88%
|
| Wupper | 84%
|
| Düssel | 80%
|
| Ems | 74%
|
| Sieg | 74%
|
| Maas | 70%
|
| Lippe | 68%
|
| Ijssel | 66%
|
| Erft | 66%
|
| Weser | 62%
|
| Rur | 48%
|
| Emscher | 48%
|
| Möhne | 38%
|
| Lenne | 34%
|
| Niers | 34%
|
| Diemel | 30%
|
| Bigge | 24%
|
| Emmer | 24%
|
| Vechte | 16%
|