Ésera

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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The river as seen from a foot bridge
The Ésera and the Cinca in the basin of Ebro