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West Eifel Volc Field
The Mehrener maar is one of about 80 maars of the West Eifel volcanic field. The village of Mehrener is located on the shore of a lake partially filling the crater, whose rim lies behind the village. Maars, scoria cones, and small stratovolcanoes cover an area of 600 sq km west of the Rhine River. Most originated during eruptions between about 730,000 and 10,000 years ago.