The Volga is the longest river in Europe, stretching over 2, 300 miles from its source in the Valdai Hills of central Russia to its delta on the Caspian Sea. It is the longest river in Europe and the 15th longest river in the world. The Volga is also the most voluminous river in Europe, with an average discharge of about 55, 000 cubic feet per second. It is a major source of water for irrigation, drinking water, and hydroelectric power. The Volga is also an important transportation route, connecting many cities along its course.