The water from this canal already flows towards the Atlantic, towards Ariège and the Garonne. On the other hand, a few meters back, at the Pimorent (Puymorens) pass, the waters still flow south, towards the Mediterranean, through the Querol, Segre and Ebre rivers. The Pimorent (Puymorens) pass is the natural boundary between the two slopes, between Catalonia (to the south) and Occitania (to the north):