Laacher See

Laacher See (German pronunciation: [ˈlaːxɐ ˈzeː]) or Lake Laach (in English) is a volcanic caldera lake with a diameter of 2 km (1.2 mi) in Rhineland-Palatinate, Germany, about 24 km (15 mi) northwest of Koblenz and 37 km (23 mi) south of Bonn, and is closest to the town of Andernach situated 8 km (5.0 mi) 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 Vulkan Eifel. The lake was formed by a Plinian eruption approximately 12,900 years BP with a Volcanic Explosivity Index (VEI) of 6, on the same scale as the Pinatubo eruption of 1991.