The Grünhirscher Stollen is an adit for water drainage in Sankt Andreasberg, in the Harz mountains. It was created during mining in the Upper Harz and named after the valley Grüner Hirsch between the mountains Galgenberg and Glockenberg. It leads from the Samson Pit to the south-west of the Galgenberg.
The first 7.1 km of the 10.2 km adit is part of the Upper Harz Water Regale and has been declared UNESCO World Heritage Site.
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