Kubnya
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 . 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".