Related Clues:
- Steel-producing valley
- Coal area
- River of Germany's steel-making region
- German mining region
- Moselle feeder
- German coal region
- Rhine valley region
- Where Essen is
- Rhine tributary
- German region
- Region bordering the Rhine
- Essen's valley
- Coal-rich region
- Rhineland region
- River through Mülheim and Dortmund