Arrondissement of Châtellerault
The arrondissement of Châtellerault is in northern Vienne  and is bordered to the northwest by the Maine-et-Loire department, to the north and east by the Indre-et-Loire department, to the southeast by the Indre department (a small part) and the arrondissement of Montmorillon, to the south by the arrondissement of Poitiers and to the west by the  Deux-Sèvres department.