Historic centre of Sástago Monument · Sástago, Ribera Baja del Ebro, Zaragoza Image of Sástago, not of the place itself. Historic centre of Sástago, in the Ribera Baja del Ebro (Zaragoza), located next to the ducal palace and near the Monastery of Rueda. According to the description made of the town by Pascual Madoz in the mid-19th century, it had several fairly spacious and clean streets, and three squares. Photo: Marcal Casas Cartagena (CC BY-SA 3.0) What to see and do in Sástago