What is "kiliansteich"

The Kiliansteich (literally " St. Kilian's Pond") is one of the oldest reservoirs in Germany. The reservoir is located near Straßberg (Harz) in the German state of Saxony-Anhalt and supplies drinking water. It impounds the Büschengraben stream. The lake is part of the heritage area (Flächendenkmal) of the Lower Harz Pond and Ditch System.

The reservoir has a rockfill dam with a watertight clay core that sits on a shale bedrock.