- a river flowing from the Valdai Hills in the W Russian Federation E and then S to the Caspian Sea: the longest river in Europe. 2,325 miles (3,745 km).
- a river in W Russia, rising in the Valdai Range and flowing through a chain of small lakes to the Rybinsk Reservoir and south to the Caspian Sea through Volgograd: the longest river in Europe. Length: 3690 km (2293 miles)
