The Ruhr is a river in western Germany, a right tributary of the Rhine. The source of the Ruhr is near the town of Winterberg in the mountainous Sauerland region, at an elevation of approximately 670 metres. It flows into the lower Rhine at an elevation of only 17 metres in the municipal area of Duisburg. Its total length is 219 km, its average discharge is 79 cubic …The Ruhr is a river in western Germany, a right tributary of the Rhine. The source of the Ruhr is near the town of Winterberg in the mountainous Sauerland region, at an elevation of approximately 670 metres. It flows into the lower Rhine at an elevation of only 17 metres in the municipal area of Duisburg. Its total length is 219 km, its average discharge is 79 cubic metres per second at Mülheim near its mouth. Thus, its discharge is, for example, comparable to that of the river Ems in Northern Germany or the River Thames in the United Kingdom.