The Caspian Sea Feeder is a term used to describe the five rivers that feed into the Caspian Sea. These rivers are the Ural, Yser, EMS, Elbe, Ural River, and Volga River. The Ural River is the longest of the five rivers, stretching over 2, 500 miles from its source in the Ural Mountains to its mouth in the Caspian Sea. The Yser River is a small river located in Belgium and France, while the EMS River is a short river located in Germany. The Elbe River is the longest river in Central Europe, flowing through Germany, the Czech Republic, and Poland. The Ural River is a major river in Russia, while the Volga River is the longest river in Europe, stretching over 2, 300 miles from its source in the Valdai Hills to its mouth in the Caspian Sea.