Arrondissement of Castelsarrasin
The arrondissement is bordered to the north by the Lot (Occitanie) department, to the east by the arrondissement of Montauban, to the south by the Haute-Garonne (Occitanie) department, to the southwest by the Gers (Occitanie) department and to the northwest by the Lot-et-Garonne (Nouvelle-Aquitaine) department.