Isuela River Nature · Calcena, Aranda, Zaragoza Image of Calcena, not of the place itself. River that rises on the southern slope of a 1616-metre pass, on the southern foothills of the Sierra del Moncayo, in the Soria municipality of Beratón, and is in turn a tributary of the Aranda river, itself a tributary of the Jalón. After its first kilometres in Castilla y León, it enters the province of Zaragoza and turns southeast, crossing Purujosa, Calcena, Trasobares, Tierga, Mesones de Isuela and Nigüella, before flowing into the Aranda before Arándiga. In Calcena, at 836 metres above sea level on the southern slope of the Somontano del Moncayo and partly protected by the natural park of the same name, the town climbs from the river's left bank towards the peaks of San José and Santa Bárbara, while orchards occupy the lower part of the valley. Photo: Jerónimo Cósida (Public domain) What to see and do in Calcena