Related Clues:
- River and industrial region of northwest Germany
- Region near Düsseldorf
- River of France and Germany
- European coal center
- Dortmund's region
- Coal-rich area in Europe
- River that rises in the Vogesen Mountains
- Valley of Essen
- German river flowing into the Rhine
- River of western Germany
- Oberhausen's region
- German industrial zone, river
- Rhine tributary, coal district
- Robotic play set around hard industrial valley
- Ger. industrial region