east: Fuentes Carrionas Massif, Peña Prieta 2,536 m, close to the eastern end of the Picos de Europa Sierra Cocón above Tresviso Sierra del Escudo de Cabuérniga, a northern foothill of the system, located between the main ridges and the sea Sierra de la Gándara, Peña Cabarga 537 m, a lower northern foothill located further east Montes de Ucieda Alto del Gueto Sierra de la Matanza Sierra de Peña Sagra, Peña Sagra 2,046 m Sierra de Peña Labra, Pico Tres Mares 2,175 m and Peña Labra 2,006 m Sierra del Cordel in the Saja and Nansa Comarca Sierra del Escudo, between Campoo de Yuso and Luena Sierra de Híjar, foothills located in the high plateau at the southeastern end of the central zone Valdecebollas Sierra del Hornijo, Mortillano 1,410 Sierra de Breñas, foothill running perpendicular to the coast Montes de Pas, Castro Valnera 1,707 m in the transition area to the Basque Mountains Eastern The Basque Mountains at the eastern end of the system, with very eroded Mesozoic folds and ranges of moderate height: Inner ranges: Sierra Salbada (Orduña) Mounts of Gasteiz, Kapildui 1,177 m Izki Urbasa, Baiza 1,183 m Andía, with the impressive Beriain 1,493 m Coastal ranges: Gorbea (Gorbeia) 1,481 m Urkiola, Anboto 1,331 m Elgea Aizkorri, Aitxuri 1,551 m, highest peak in the Basque Mountains Altzania, Aratz 1,442 m Aralar, Txindoki 1,346 m Other important mountains close to the sea include Ganekogorta, Oiz, Sollube, Arrate, Kalamua and Hernio Flora and fauna The Cantabrian Mountains are home to an important variety of plant life, as well as the Cantabrian brown bear (Ursus arctos pyrenaicus), catalogued as being in danger of extinction, which extends from Asturias (the region where its population is bigger) to areas in Léon, Palencia and Cantabria, and the Cantabrian capercaillie (T. urogallus cantabricus). Other animals associated with the range include the Iberian wolf (Canis lupus signatus) and the rebeco, or Cantabrian chamois (Rupicapra pyrenaica parva). Woodland in the Cantabrian Mountains is generally predominated by beeches (Fagus sylvatica). The Pyrenean ibex (Capra pyrenaica pyrenaica), one of the four subspecies of the Iberian ibex (Capra pyrenaica), which used to inhabit the Cantabrian Mountains, became extinct in 2000. Protected areas The Cantabrian mountain range includes several protected areas such as the Picos de Europa National Park, which is one of several Cantabrian parks included in UNESCO's World Network of Biosphere Reserves. Some of the sites are included in