The Volga River is the longest river in Europe, stretching over 2, 300 miles from its source in the Valdai Hills to its delta in the Caspian Sea. The Loire River is the longest river in France, flowing for over 600 miles from its source in the Massif Central to the Atlantic Ocean. The Oder River is a major river in Central and Eastern Europe, forming part of the border between Germany and Poland. The Elbe River is a major river in Central and Western Europe, flowing for over 700 miles from its source in the Czech Republic to the North Sea. The Yser River is a small river in Belgium, flowing for just over 50 miles from its source in France to the North Sea. Finally, the DANUBE River is the second longest river in Europe, stretching for over 1, 700 miles from its source in Germany to its delta in the Black Sea.