Sumka
Location
Country	Tatarstan, Russia
Physical characteristics
Source
• location	Gremyachy Klyuch, Zelenodolsky District
• coordinates	55°58′54″N 48°58′16″E / 55.98167°N 48.97111°E / 55.98167; 48.97111
Mouth	Volga
• location	Kuybyshev Reservoir near Vasilyevo, Zelenodolsky District
• coordinates	55°49′45″N 48°38′47″E / 55.8293°N 48.6464°E / 55.8293; 48.6464
• elevation	53 m (174 ft)
Length	37 km (23 mi)
Basin size	250 km2 (97 sq mi)
Basin features
Progression	Volga→ Caspian Sea

The Sumka (Russian: Сумка; Tatar: Сумка) is a river in Zelenodolsky District of the Republic of Tatarstan, Russia, a left-bank tributary of the Volga. It is 37 kilometres (23 mi) long, and its drainage basin covers 250 square kilometres (97 sq mi). 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 cubic metres per second (1,100 cu ft/s). The river used to dry up in summer.^[1]

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