Circular route that runs through the surroundings of the old Spa of Fuente Agria de Villaharta and links several historical sources of mineral-medicinal waters, closely linked to the ethnographic and cultural heritage of the municipality. The itinerary begins in the Elías Cervelló Park, in Villaharta, and connects old paths, cattle trails and sections related to the GR-48, the GR-40 and the Mozarabic Way of St. James. During the tour we visit fountains such as Boca del Infierno, La Belleza, El Cordel, Malos Pasos, La Lastrilla and Fuente Agria, as well as other elements linked to the old spa use of the area. It is a comfortable and low-difficulty route, suitable for hiking and for getting to know the mountain landscape, the memory of the sour water and the thermal past of Villaharta.