What body of water does the River Volga discharge into?

Explanation

The Volga is Europe's longest river. It is approximately 3700 kms long and discharges into the Caspian Sea. It rises in the Valdai Hills 226 meters above sea level north-west of Moscow. Almost half of all river-traffic in the entire world takes place on the Volga. Volga is one of many very polluted rivers in Europe.