The Hölloch is a 200.4 km long cave in the municipality Muotathal in Switzerland. In addition to being the second longest cave in Europe and the 11th longest of the world, it is also notable for having a depth of 1,033 m. The Hölloch is an example of a karst cave system.
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Address Hölloch, 6436 Muotathal, Switzerland
Coordinates 46°58'35.328" N 8°47'19.874" E
