- Ruhr, Ruhr River - a tributary of the Rhine
--1 is a kind of river
--1 is a part of Germany, Federal Republic of Germany, Deutschland, FRG - Ruhr, Ruhr Valley - a major industrial and coal mining region in the valley of the Ruhr river in northwestern Germany
--2 is a kind of geographical area, geographic area, geographical region, geographic region
--2 is a part of Germany, Federal Republic of Germany, Deutschland, FRG