The Mont-rebei gorge, created by the river Noguera Ribagorçana as it passes throughthe Montsec mountains, separating the Montsec d'Ares from the Montsec de l'Estall and is the only great gorge in Catalonia (Spain) which has been kept more or less intact without being crossed by any road, railway or electricity line. It is only crossed by a mule track partially dug out of the rock, allowing this spot to be enjoyed in a very spectacular manner. The walls of the gorge reach vertical heights in excess of 500 metres at points where the minimum width of the gorge is no more than 20 metres.
The classical Mont-rebei path (GR-1) is about 4 km long and takes about 4 hours, 2 hours there and two back. Perfect for an all-day trip. The path runs down a very smooth slope and enters the gorge; after crossing the gorge you may prolong your walk by a steady, moderate climb to Carlets Farmhouse. Be careful in the gorge sector: it is not suitable for people with vertigo or who are not used to heights. By car, the furthest you can go is to the Masieta area (car park). You may choose either to undo the same path (2h) or to continue across towards the area of the Mare de Déu de la Pertusa and Corçà (another 2h 30 mins).