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Key Facts about Lake Laach

June 26, 2026

More than 1,000 tiny earthquakes have exposed a deeper, slanted reservoir beneath Germany’s Lake Laach volcano, not the vertical body scientists expected.

About Lake Laach:

  • Lake Laach, also known as Laacher See, is a volcanic caldera lake located in Rhineland-Palatinate, Germany.
  • It is the largest lake in Rhineland-Palatinate.
  • It is part of the East Eifel volcanic field within the larger volcanic Eifel region.
  • The lake is oval in shape and surrounded by high banks.
  • It was formed by a massive volcanic eruption.
  • Traces of volcanic activity can still be found in the form of volcanic outgassing, the so-called mofettes, on the eastern shore of the lake.
    • Small bubbles rise up in the water - these so-called mofettes are rising carbon dioxide and illustrate the volcanic history of the lake.
  • The lake has no natural outlet but is drained by a tunnel dug before 1170 and rebuilt several times since. 

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