Laacher See, also known as Lake Laach or Laach Lake, is a volcanic caldera lake with a diameter of 2 km in Rhineland-Palatinate, Germany, about 24 km northwest of Koblenz, 37 km south of Bonn, and 8 km west of Andernach. From Wikipedia
Well-known and secluded waters from the Eifel to the Nordic plains draw swimmers, anglers and hikers in landscapes safeguarded for their natural diversity.