Laacher See or Laach Lake is a volcanic caldera lake with a diameter of 2 km in Rhineland-Palatinate, Germany, about 24 km northwest of Koblenz and 37 km south of Bonn, and is closest to the town of Andernach situated 8 km to the east on the river Rhine. It is in the Eifel mountain range, and is part of the East Eifel volcanic field within the larger Vulkaneifel. The lake was formed by a Plinian eruption approximately 12,900 years ago with a Volcanic Explosivity Index of 6, on the same scale as the Pinatubo eruption of 1991.
The lake is oval in shape, and surrounded by high banks. The lava was quarried for millstones from the Roman period until the introduction of iron rollers for grinding corn.
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