What is the longest river shown on the europe physical map?

The longest river shown on the Europe physical map is the River Volga found in European Russia.

The Volga river flows 2,294 miles from the Valdai Hills through central Russia  and eventually discharges into the Caspian sea.

The word Volga  is derived from a Slavic word meaning moisture or wetness.

The Volga river's water shed (area of  land drained by the river) is 532, 821 square miles in size.

The major tributaries of  Volga River are Kama River and Oka River