River Ruhr, an important tributary of the lower Rhine, rises on the north side of Winterberg and flows 235km west past Witten (the head of navigation), Essen, and Mülheim to enter the Rhine at Duisburg. Its functions chiefly as a supplier of water and is dammed in many places to form lakes and reservoirs. Nearby canals carry the bulk of the water traffic. The river has given its name to one of the world’s largest single industrial regions.
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