Arnsberg is one of the five Regierungsbezirks of North Rhine-Westphalia, Germany, located in the west-central part of the country. It covers the Sauerland hills as well as the east part of the Ruhr area.
The region was founded in 1815 as a subdivision of the Prussian Province of Westphalia.
Wikipedia https://en.wikipedia.org/wiki/Arnsberg_(region)
Official Website https://www.bezreg-arnsberg.nrw.de/
Coordinates 51°24'0.858" N 8°3'38.127" E