Montrebei is well known for its spectacular gorge (the Congost de Mont-rebei) and numerous ravine walkways. It divides Catalonia from Aragon in Spain, north of Lleida and east of Huesca. The climbing is on high limestone walls centred along the Pared (wall) de Aragon and the Paret de Catalunya.
The Pared de Aragon section of the guidebook also includes the sectors Pared de los Moros and la Muralla. The Paret de Catalunya section includes Agulla del Forat, Espero Espereste, Aguja de San Martin, el Gendarme, and el Congost de Montrebei.