Longest river in Europe

Photo from Wikimedia Commons
Volga River
Europe's longest river, draining a third of European Russia/Rivers
The Volga is the longest river in Europe at 3,530 km, flowing from the Valdai Hills northwest of Moscow south to the Caspian Sea. Its drainage basin of 1.38 million square kilometers covers about one-third of European Russia. The Volga is central to Russian identity, often called 'Mother Volga' (Volga-Matushka). Eleven of Russia's twenty largest cities, including Nizhny Novgorod, Kazan, Samara, and Volgograd (formerly Stalingrad), sit along its banks. The Volga-Don Canal connects it to the Black Sea and thus to the world's oceans.
Measurements
1.38 million km2
Per second at the delta
Valdai Hills
28,000 km2 at the Caspian Sea
At Kuibyshev Reservoir