Which river is the longest in Europe, flowing entirely through European Russia and discharging into the Caspian Sea?

💡 Solution & Explanation

The Volga River is the longest river in Europe, spanning approximately 3,530 kilometers entirely within European Russia before emptying into the landlocked Caspian Sea. While the Danube flows through multiple Central and Eastern European countries, it drains into the Black Sea, and the Rhine empties into the North Sea. The Volga basin holds immense economic importance for Russia, generating a massive share of the nation's inland water transport and hydroelectric power.