It leaves the high mountains and flows to the south through the Canfranc valley and then turns to the west in Jaca. In Jaca, its discharge is but it is increased by some tributaries as Gas, Lubierre, Candanchú, Estarrún, Aragón Subordán, Aragón Veral and Esca. When the river gets into Yesa, where is the Yesa dam, the discharge is .