The Hers-Mort is a 89.3-kilometre (55.5 mi) long river in southern France, a right-bank tributary of the Garonne. Its average flow rate is 4 cubic metres per second (140 cu ft/s). The Hers-Mort rises in the Lauragais region, near the village Fonters-du-Razès, in the Aude department. It flows northwest through the following departments and towns:Aude: Payra-sur-l'Hers, Salles-sur-l'Hers Haute-Garonne: Villefranche-de-Lauragais, Baziège, Toulouse, Saint-Jory