The Great Tsivil or simply Tsivil (also spelled Tzivil and Civil /sɪˈvɪl/), is a river in Chuvashia, Russian Federation, a right tributary of the Volga in its lower course. The Tsivil is 170 km (110 mi) long, and its watershed area is 4,690 km (1,810 sq mi). Near Tsivilsk is the Little Tsivil, which joins the Great Tsivil, forming the river Tsivil; said river flows into the Volga near Novocheboksarsk. Other major tributaries are the Unga and Kuganar. Tsivil's yearly runoff volume is 640,000,000 m (520,000 acre⋅ft).