Germany's industrial heart

• Between two rivers, what was that industrial region?
• West German region
• German industrial region
• Rhine tributary in Germany
• Krupp family home
• Duisburg's locale
• Miner hurries over fences in industrial region
• Deutschland coal section
• Dortmund's region

Wikipedia Word definitions in Wikipedia
Ruhr is the name of a département of the Grand Duchy of Berg , a satellite state of the First French Empire , in present day Germany . It was named after the river Ruhr , which flows through the département. The capital was Dortmund .