This is a mountaineering guide to one of Spain’s premier ranges, and includes detailed descriptions for 60 routes spread around the whole of this magnificent mountain chain. Based on selected valley bases, the routes are readily accessed. All the routes can be done in a day, and are circular, whilst in difficulty they vary from straightforward, half-day outings to strenuous, full-day ascents demanding fitness, good overall mountain skills, and the ability to deal with short sections of scrambling. Four specialist topics are also covered, place names, transhumance, the Civil War, and Alpine flora. The area is one of the best preserved continuous mountain areas in Spain, together with the neighbouring Picos de Europa.