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The '''Ruhr''' is a river - in fact, a tributary of the [[Rhine]] - in the province of [[Nord Rhein-Westfalen]] in [[Germany]].  In the early 20th Century it developed into one of Germany's primary zones for heavy industrial production.  Its industries include coal mining, iron and steel manufacture, and heavy engineering production. Major centres of the Ruhr include [[Bochum]], [[Dortmund]], [[Duisburg]], [[Essen]], and [[Gelsenkirchen]]. The conurbation has a population of 5.3 million.

The '''Ruhr''' is a conurbation in the western [[German]] state of [[Nord Rhein-Westfalen]].  In the early 20th Century it developed into one of Germany's primary zones for heavy industrial production.  Its industries include coal mining, iron and steel manufacture, and heavy engineering production. Major centres of the Ruhr include [[Bochum]], [[Dortmund]], [[Duisburg]], [[Essen]], and [[Gelsenkirchen]]. The conurbation has a population of 5.3 million.

The conurbation takes its name from the River Ruhr, which roughly marks the southern boundary of the district (which extends westwards to the Rhine and northwards to the River Lippe). The name Ruhr is believed to derive from an [[Indo-European]] root word ''reu'', meaning 'to hollow out'.

The conurbation takes its name from the River Ruhr, which roughly marks the southern boundary of the district (which extends westwards to the Rhine and northwards to the River Lippe). The name Ruhr is believed to derive from an [[Indo-European]] root word ''reu'', meaning 'to hollow out'.