Spring of l'Avellà Nature · Catí, L'Alt Maestrat, Castellón Image of Catí, not of the place itself. The spring of l'Avellà is a source of waters with therapeutic properties already known to the Arabs, in the district of Catí. Its waters are used at a spa located in the same peaceful spot occupied by the hermitage of Nuestra Señora de la Misericordia, a group that forms one of the most appreciated corners of the municipality's natural surroundings. Photo: Juan Emilio Prades Bel (CC BY-SA 4.0) What to see and do in Catí