Sierra de Grazalema Natural Park is one of the wettest places in the Iberian Peninsula. Straddling the provinces of Cadiz and Malaga this 534 km sq limestone massif is also one of the most rugged areas in Andalucia. For that reason, many of the walks, particularly in the northern part of the Sierra, require a permit that can be obtained from the tourist office in Grazalema itself or the one in El Bosque.