Question

which is the longest river of Europe which flows through Russia before joining the Caspian sea​

Answer 1

Answer:

The Volga is the longest river in Europe, and its catchment area is almost entirely inside Russia, though the longest river in Russia is the Ob–Irtysh river system. It belongs to the closed basin of the Caspian Sea, being the longest river to flow into a closed basin.

Answer 2

Answer:

the Volga is the longest river in Europe