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Ier River (Barcău)

Ier
Ér
River
Countries Romania, Hungary
Counties Satu Mare County, Bihor County, Hajdú-Bihar County
Tributaries
 - left Checheț
 - right Salcia
Villages Andrid, Săcueni, Diosig, Pocsaj
Mouth Barcău (Berettyó)
 - location Pocsaj
 - coordinates 47°16′40″N 21°47′59″E / 47.2779°N 21.7997°E / 47.2779; 21.7997Coordinates: 47°16′40″N 21°47′59″E / 47.2779°N 21.7997°E / 47.2779; 21.7997
Progression BarcăuCrișul RepedeKörösTiszaDanubeBlack Sea

The Ier or Eriu (Hungarian: Ér) is a right tributary of the river Barcău (Berettyó) in Romania and Hungary. It discharges into the Barcău in Pocsaj. The Andrid Dam is constructed on this river. The Ier flows through the villages Mihăieni, Eriu-Sâncrai, Ghirolt, Rădulești, Hotoan, Sudurău, Dindești, Andrid, Sălacea, Cherechiu, Săcueni, Diosig in Romania, and Pocsaj in Hungary.

The Hungarian name of the river means "brook". The Romanian name derives from that.

The following rivers are tributaries to the River Barcău:



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