Sumka (river)

The Sumka (Сумка; Сумка) is a river in Zelenodolsky District of the Republic of Tatarstan, Russia, a left-bank tributary of the Volga. It is 37 km long, and its drainage basin covers 250 km2. It begins near Gremyachy Klyuch and flows to the Kuybyshev Reservoir, Volga, forming the western border of Vasilyevo, Tatarstan.

The river valley comes through the Raifa section of the Volga-Kama Reserve. There the Sumka passes several major lakes, the biggest being Raifa lake. The maximal mineralization 200 mg/L. The maximal water discharge is 30 m3/s. The river used to dry up in summer.