They are located between the valleys of rivers Isábena and the Escales Reservoir, Noguera Ribagorzana, in the Ribagorza comarca, Aragon, Spain.

[1] The ridge's highest summits are Pico de l'Amorriador (1791 m) and Puialto (1782 m).

This mountain chain rises abruptly from a plain and looks quite impressive from certain angles, therefore in ancient geographic works this range was also referred to as "the Great Mountains of Sis" (Spanish: la gran sierra de Sis) owing to the massive appearance of its mountains, abruptly rising as mighty foothills of the Pyrenees.

[2] The summits of this mountain chain offer an excellent lookout point to have a view of some of the main peaks of the Pyrenees from the south, as well as of the magnificent El Turbón in the west.

[3] Some of the steep rocky cliffs of the range are popular with rock climbers.