Uy River (Tobol basin)

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The Uy River (Russian: Уй, Bashkir: Уй) is a river in Chelyabinsk Oblast in Russia with its upper reaches in Bashkiria. It partially flows along the borders of Chelyabinsk and Kurgan Oblasts with Kazakhstan. The Uy is a left tributary of the Tobol River. The length of the river is 462 km. The area of its basin is 34,400 km². It freezes up in November and stays icebound in April. The town of Troitsk and three reservoirs (the largest being Troitsk Reservoir) are situated on the Uy River.

It rises in the southern Ural Mountains east of the headwaters of the Ural River between Chelyabinsk and Magnitogorsk and flows east with many meanders past Troitsk, Chelyabinsk Oblast to meet the Tobol River near Zverinogolovskoye (formerly the fort of Ust-Uysk). The gold-mining town of Plast (town) is on its headwaters. At the time of the Bashkir War of 1735-40 it was the eastern end of the Orenburg Line of forts and is now approximately part of the border between Russia and Kazakhstan. The Uy is the southernmost river on the east side of the Urals whose waters ultimately reach the Arctic Ocean. South of the Uy waters run to the Ural River which flows south into the Caspian Sea.

The name of the river comes from the Bashkir language, in which it means "valley, lowland".

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Coordinates: 54°17′54″N 63°58′45″E / 54.2983°N 63.9792°E / 54.2983; 63.9792