The "arrondissement" of Sarrebourg-Château-Salins is the most southern of the "arrondissements" of the Moselle department. It is bordered to the north by the Forbach-Boulay-Moselle and the Sarreguemines "arrondissements", to the northeast and east by the Bas-Rhin department, to the south by the Meurthe-et-Moselle department and to the west by the Metz "arrondissement".