rhenish slate mountains
mountainous highlands lying mainly in northwestern Germany but also extending westward as the Ardennes through southeastern Belgium and northern Luxembourg, with an overlap into eastern France beyond the Meuse River. The Highlands form a greatly varied plateau with areas of rugged relief, as in the Eifel and the Rothaargebirge in the region of Sauerland, though these nowhere exceed 3,000 feet (900 m). Other highlands include the Taunus, the Hunsruck south of the Mosel River, and the Westerwald.
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