The "arrondissement" is bordered to the north by the Lot-et-Garonne (Nouvelle-Aquitaine) department, to the west by the Tarn-et-Garonne (Occitanie) department, to the southwest by the Haute-Garonne (Occitanie) department, to the south by the "arrondissement" of Auch, and to the west by the Landes (Nouvelle-Aquitaine) department.