Declared a Biosphere Reserve by Unesco, it is a limestone massif modeled by the action of water over the centuries, which has given rise to countless caves, chasms and gorges, some of them very spectacular. Famous for its wonderful routes such as the Garganta Verde or El Pinsapar (a species of fir tree unique in Western Europe that comes from the Ice Age), make it the ideal place for lovers of nature and Active Tourism sports, not in vain is the World Hang Gliding Championship held in the surrounding area, near the Rock of Zaframagón in Algodonales.