| Fluss | Fließlänge in NRW | % Korrekt |
|---|---|---|
| Rhein | 226 km | 100%
|
| Ruhr | 219 km | 96%
|
| Lippe | 220 km | 90%
|
| Ems | 156 km | 81%
|
| Wupper | 116 km | 70%
|
| Sieg | 110 km | 64%
|
| Weser | 116 km | 58%
|
| Rur | 132 km | 52%
|
| Erft | 107 km | 43%
|
| Lenne | 129 km | 30%
|
| Niers | 110 km | 18%
|