The Ruhr coalfield is located in?

The Ruhr coalfield is located in Germany. The Ruhr area is one of the most heavily industrialized regions in Europe and is located in western Germany. The coalfield has played a significant role in the country's economic development and was one of the major sources of fuel for Germany's industrialization. Today, the region remains an important industrial center and is home to many companies involved in the production of steel, chemicals, and machinery.