The river, used for irrigation and hydroelectric power, is about 129 kilometres (80 mi) long; its chief tributary is the Arga River.[1]
Ecology
Non-government sanctioned re-introduction of Eurasian beaver (Castor fiber) in Spain around 2003 has resulted in tell-tale beaver signs documented on a 60-kilometre (37 mi) stretch on the lower course of the Aragón River and the area adjoining the Ebro River in Aragon, Spain.[2]