What is "brandberge"

The Brandberge is a protected natural area in Saxony-Anhalt, Germany, in the northwest of Halle. It is part of the Naturpark Unteres Saaletal, a protected landscape area which extends along the River Saale from Halle to Nienburg. In the past it has been used for military exercises and winter sports; during the Nazi era, the first official Thingplatz arena was built there.