Calatayud is a municipality located in the Province of Zaragoza within the autonomous community of Aragón, Spain. Situated along the river Jalón, the town is positioned in the heart of the Sistema Ibérico mountain range.
The city serves as the seat of the comarca of Calatayud. It holds significant regional importance as the second-largest town in the province of Zaragoza after its capital and remains the largest town in Aragón excluding the three provincial capitals. In recent years, the local population has experienced a decline due to migration.