The Jalón River Aqueduct, also known as the Grisén or Jalón Walls or El Caracol, is the most representative work of the construction of the Imperial Canal of Aragon, built in the 18th century.
The Larralde Raft together with the 'Ojo del Cura' and the 'Ojo del Fraile' are the last to form part of the set of Wetlands in the area, very important …