Rhenish Slate Mountains, Ger. Rheinisches Schiefergebirge, extensive mountainous plateau, W Germany, lying between W Hesse state and the borders of Belgium and Luxembourg. It comprises the Eifel, Hunsrück, Taunus, and Westerwald mts., which flank both sides of the Mosel and Lahn rivers. The plateau is dissected by the Rhine River and its tributaries.
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