The
Hers-Mort (the "Dead Hers", as opposed to the faster-flowing
Hers-Vif, or "Live Hers") is a long river in southern France, a right-bank tributary of the
Garonne. Its average flow rate is . 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: