The Usta () is a river in Nizhny Novgorod and Kirov Oblasts, Russia. It is a left tributary of the Vetluga (Volga's tributary).Уста, Great Soviet Encyclopedia It is in length, with a drainage basin of .«Река УСТА», Russian State Water Registry Most of its water comes from melting snow. The average discharge from its mouth is . The Usta freezes over in November, and stays icebound until April. It is navigable in its lower reaches. The town of Uren is located on the right bank of the Usta.
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