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.
A magical place where in a few meters the current mouth of the river Jalón joins the Ebro, the hundred-year-old boat passing between the banks and the remains of the Muslim castle and old Christian town of Castellar.