The Ésera (Spanish: [ˈeseɾa]) is a tributary of the Cinca in the High Aragon.
[1][2][3] It is part of the valley of the Ebro and its drainage basin.
Its etymology is Celtic and it is cognate with several European rivers: Isar, Jizera, Isère, Isel, IJssel, and Eisack.
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