The Sierra de Grazalema is located between the Andalusian provinces of Cadiz and Malaga, and is the site of an important relictual area of Spanish fir, a tree which has become the symbol of these mountains. This is one of the most spectacular Karstic complexes in Spain, with deep gorges and cave systems, and the most extensive complex of rivers, cavities and subterranean galleries in Andalusia. The whole of the Sierra de Grazalema Nature Reserve was declared a UNESCO Biosphere Reserve in 1977.
Grazalema is part of a mountain massif, located between the provinces of Cadiz and Malaga. Its mountains reach heights of between 600 and 1600 metres over the surrounding valleys and depressions. This is an area of steep reliefs, with narrow valleys such as the “Green Gorge”, whose walls rise up 400 metres from ground level. An important feature of Grazalema is that it is one of the points on the Peninsula which receives the most rainfall, with over 2,000 mm of water a year. Another of the singular characteristics of this mountain range is the presence of grottoes and subterranean systems, including particularly the Hundidero-Gato complex, which is the largest cave in Andalusia, or the Pileta Cave, with its prehistoric origins.