Bezdna (Tatarstan)

The Bezdna (Бездна; Бизнә) is a river in Tatarstan, Russian Federation, a left-bank tributary of the Volga, flowing into the Kuybyshev Reservoir near Kuralovo, Spassky District. It is 45 km long, and its drainage basin covers 805 km2.

The maximal mineralization is 300–500 mg/L. The average sediment deposition at the river mouth is 129 mm per year. In 1963 the average discharge was 197 m3/s. The town of Spassk, the ancestor of modern Bolgar stood on the river prior to 1956. In 1956–57 the Kuybyshev reservoir was created, flooding the town and the lower stream of Bezdna.