What is the longest river in Europe and which countries does it flow through?

The longest river in Europe is the Volga River, which flows over 3,531 kilometers (2,194 miles) from its source in the Valdai Hills of central Russia to its mouth on the Caspian Sea. The Volga River is often called the national river of Russia and is the principal waterway of western Russia. It is also one of the most important rivers in Europe, playing a major role in Russian history, culture, and economy.

The Volga River flows through a number of countries, including Russia, Kazakhstan, and Azerbaijan. The river basin covers an area of approximately 1.4 million square kilometers (540,000 square miles) and is home to over 60 million people. The river is an important source of water for irrigation, industry, and transportation, with numerous cities and towns situated along its banks.

The Volga is the longest river in Europe. It flows through 11 of Russia's 85 federal subjects: Tver Oblast, Moscow Oblast, Yaroslavl Oblast, Kostroma Oblast, Ivanovo Oblast, Nizhny Novgorod Oblast, Chuvashia, Mari El, Tatarstan, Samara Oblast, Ulyanovsk Oblast, and Astrakhan Oblast.

The Volga is 3,531 kilometers (2,194 mi) long and has a drainage basin of 1,360,000 square kilometers (520,000 sq mi). It is the largest river in Europe by both length and discharge.

The Volga rises in the Valdai Hills northwest of Moscow and flows east and southeast through the Russian Plain to the Caspian Sea. It is a major transportation artery and is used for irrigation, industry, and fishing. The Volga is also a popular tourist destination.