The Bolshaya Tereshka (Russian: Большая Терешка) or simply Tereshka is a river in the Ulyanovsk and Saratov oblasts of the Russian Federation, a right tributary of the Volga. The Tereshka is 273 kilometres (170 mi) long, and its watershed covers 9,680 square kilometres (3,740 sq mi). It begins in the Privolzhskaya Hills and flows to the Volgograd Reservoir. Ice on the Tereshka forms in November or December and thaws in March or April.