One of the largest waterworks in Europe, constructed in 1776, is 110 km long. It carries water from the Ebro to the city and serves for transport.
Wikipedia (Spanish) https://es.wikipedia.org/wiki/Canal_Imperial_de_Arag%C3%B3n
Official website http://www.canalimperial.com/index.php?sec=2
Address 2 Paseo de Colón, Zaragoza 50006, Spain
Coordinates 41°38'0.503" N -0°53'9.107" E