The Natural Park Sierra de Cazorla, Segura and Las Villas, is the largest protected natural area of Spain and great part of Europe; its area is 209,920 hectares. Located in the north-eastern province of Jaén, and joins the eastern sector of Sierra Morena to the system which conforms Subbético mostly.
This park is the birthplace of two of the major rivers of the Iberian Peninsula, the Guadalquivir, which flows into the Atlantic and the Segura, as it does in the Mediterranean. It also has many swamps and lakes; among the first ones, it emphasizes "El Tranco de Beas."
These mountain ranges have a wealth of flora and fauna, with a total of 24 endemic species.