Saarlouis is a Kreis in the middle of the Saarland, Germany. Neighboring districts are Merzig-Wadern, Sankt Wendel, Neunkirchen, Saarbrücken, and the French département Moselle.
Wikipedia https://en.wikipedia.org/wiki/Saarlouis_(district)
Coordinates 49°18'59.278" N 6°44'59.445" E