The Kubnya (; ; ) is a river in Chuvashia and Tatarstan, Russian Federation, a left-bank tributary of the Sviyaga. It is long, of which are in Tatarstan, and its drainage basin covers .«Река Кубня», Russian State Water Registry It begins in Chuvashia and flows to the Sviyaga south of Burunduki.
A major tributary is the Uryum. The maximal mineralization is 500–800 mg/L. The average sediment deposition at the river mouth per year is . The maximal water discharge is . Drainage is regulated. Since 1978 it is protected as a natural monument of Tatarstan.
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