The Cantabrian Mountains ("Cordillera Cantábrica") form Asturias's natural border with the province of León to the south. In the eastern range, the Picos de Europa National Park contains the highest and arguably most spectacular mountains, rising to at the Torrecerredo peak. Other notable features of this predominantly limestone range are the Parque Natural de Redes in the central east, the central Ubiñas south of Oviedo, and the Parque Natural de Somiedo in the west. The Cantabrian mountains offer opportunities for activities such as climbing, walking, skiing and caving, and extend some in total, as far as Galicia province to the west of Asturias and Cantabria province to the east. Similar opportunities are available for the traveler of Asturias interested in Caldoveiro Peak.