Its highest point is Mount Toloño at 1271 metres above sea level in the municipality of Labastida.
It is noted for its steep rock faces on the southern side, and extensive forests in the north.
Resident species in these mountains include the golden eagle, peregrine falcon, Griffon vulture, Egyptian vulture, Eurasian eagle-owl, Bonelli's eagle, red kite and common kestrel.
Other larger mammals such as the roe deer, red fox and wild boar can occasionally be seen.
[3] The ruins of the Monastery of Santa María de Toloño are located in a meadow at 1201 metres above sea level.