The "arrondissement" of Apt is in the most southern of the "arrondissements" of the Vaucluse department. It has the Alpes-de-Haute-Provence department to the east, the Var department to the southeast (for a very short distance), the Bouches-du-Rhône department to the south and west, the Avignon "arrondissement" to the northwest and the Carpentras "arrondissement" to the north.