Calw is a Landkreis in the middle of Baden-Württemberg, Germany. Neighboring districts are Karlsruhe, Enz, the district-free city Pforzheim, Böblingen, Freudenstadt and Rastatt.
Wikipedia https://en.wikipedia.org/wiki/Calw_(district)
Coordinates 48°42'40.359" N 8°44'42.735" E
