This impressive ravine extends for 20km about a basin where the hamlet of la Hermida nestles. The jagged gorge scored by the Deva is so narrow and starved of sunlight as to be bare of vegetation. Before or after passing through the gorges, stop at Nuestra Señora de Lebeña to admire the small 10C Mozarabic church. Potes, a delightful village in an attractive site set in the hollow of a fertile basin against the backdrop of the sharp ridges Cordillera centrale.