The Boyuk Chay River (In Persian: بویوک چای) is a river in northwest Iran. Boyūk Chāy River, Iran .Chāy Boyūk: Iran National Geospatial-Intelligence Agency, Bethesda, MD, United States.

The river is at 37°58'0"N and 47°45'0"E between Sarab and Ardabil, near Kalian, has an elevation of 1475meters Chay Boyuk - Ostan-e Azarbayjan-e Gharbi, Iran. and flows into Lake Urmia via Aji Chay River.

The area has a cold semi-arid (climate).

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