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A city of west-central Germany near the confluence of the Ruhr and Rhine Rivers north of Cologne. Founded in the ninth century, it is a major iron and steel center.
(Placename) a city in W Germany, in North Rhine-Westphalia: the leading administrative centre of the Ruhr; university. Pop: 589 499 (2003 est)
a city in W Germany in the Ruhr River valley. 623,000.