Karlsruhe is a Landkreis in the northwest of Baden-Württemberg, Germany. Neighboring districts are Rhein-Neckar, Heilbronn,
Enz, Calw, Rastatt, Germersheim, Rhein-Pfalz-Kreis and the district-free city Speyer. The urban district Karlsruhe, which contains the City of Karlsruhe, is located in the middle of the district, and partially cuts it into a northern and a southern part.
Wikipedia https://en.wikipedia.org/wiki/Karlsruhe_(district)
Coordinates 49°0'24.734" N 8°24'12.31" E