Where the Sierras of Segura and Alcaraz push northwards into the southeastern plains of La Mancha, they form spectacular mountains, broken up by dramatic gorges and fertile valleys. The source of the Río Mundo is a favourite beauty spot. Nearby Riópar, perched on the side of the mountain, has a 15th-century parish church. Among the less-explored villages, Letur, Ayna, Yeste and Liétor are especially picturesque. Their narrow, winding streets and craft traditions clearly reflect their Muslim origins.