The greenway of La Demanda is the old mining-railway in the heart of the Sierra de la Demanda, and is one of the most suitable and interesting paths around northern Spain for hiking and mountain-biking. Its 56 kilometers will reveal firsthand the beauty of its mountains, the botanical diversity of its sumptuous forests, the diverse wildlife that inhabits its intricate landscape and the geological treasures kept inside these ancient mountains. The most interesting stages of this hiking are the ones close to Arlanzón and to Pineda de la Sierra, and from Pineda to Riocavado de la Sierra and Barbadillo de Herreros.