In the Montsec mountains, the pre-Pyrenees of Lleida, making natural border between Catalonia and Aragon, Noguera Ribagorzana has created over the years one of the most privileged and wild landscapes of the country: The Gorge Montrebei.És the Catalonia only gorge which is still virgin without road, rail ... only a path carved into the rock that can spend caminant.Ara But this time we will know the gorge from the water! With the canoe and paddle in hand we enter the calm waters that separate the Montsec d'Ares (Catalonia) Montsec of Estall (Aragon).