Explanations:
Volga River is the longest river in Europe with a length of about 3530 km. It is also Europe's largest river in terms of discharge and of drainage basin. Rising in the Valdai Hills 228 meters (748 ft) above sea level northwest of Moscow , It flows through central Russia and drains into the Caspian Sea. It is also known as the national river of Russia. It has two main tributaries named Kama and Oka.