| Bolshaya Tereshka River | |
| Mouth Coordinates: | 51.8169°N 46.5425°W |
| Subdivision Type1: | Country |
| Length: | 273km (170miles) |
| Discharge1 Avg: | 17.5m3/s recorded 46km (29miles) from mouth |
| Basin Size: | 9680km2 |
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 273km (170miles) long, and its watershed covers 9680km2.[1] 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.