It source is in the Pyrenean Serra del Cadí in the municipality of Castellar de n'Hug (Berguedà) and its valley is one of the main north–south communication routes in Catalonia.
The origin is situated in the Pyrenean Serra del Cadí, which is part of the municipality of Castellar de n'Hug (Berguedà). The valley it resides in is one of the main north-south pathways for travel within Catalonia.