The "arrondissement" of Tournon-sur-Rhône is bordered to the north by the Loire department, to the northeast by the Isère department, to the east by the Drôme department, to the south by the "arrondissement" of Arrondissement of Privas, to the southwest by the "arrondissement" of Arrondissement of Largentière and to the west by the Haute-Loire department.