It flows through the towns of Doullens, Auxi-le-Château, Nempont-Saint-Firmin and Nampont, finally flowing out into the Channel near Berck.
Mengalir melalui kota Doullens, Auxi-le-Château, Nempont-Saint-Firmin dan Nampont, akhirnya masuk ke Channel melalui Berck.