The Cidacos valley extends for 34km from Calahorra to Arnedillo. This mountainous region offers visitors magnificent landscapes where the ochre soil provides a striking contrast to the verdant countryside. Renowned for its 110 palaeontological sites, the region also boasts ruins and monuments from the Romanesque and medieval periods. Highlights not to be missed include the historic Calahorra district, the Herce castle belvedere and the Arnedillo thermal baths.