The nature reserve of Schlangenberg which means snake-mountain is located in the west of Germany close to the Dutch and Belgian border. The reserve is near the village Breinigerberg, 15 kilometres from Aachen or 7 kilometres distant from the city of Stolberg. Schlangenberg itself is a small hill peaking 276 m above sea level.
The 124 hectares large area is famous for its calamine flora.
Wikipedia https://en.wikipedia.org/wiki/Schlangenberg_Nature_Reserve
Coordinates 50°44'25.398" N 6°15'2.14" E
