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The Danube, the second longest river in Europe.

Rivers are natural flowing watercourses that usually consist of freshwater, flowing towards an ocean, sea, lake or another river. If a river flows into another larger river then it will be called a tributary. In some cases, a river can flow into the ground and become dry at the end of its course, without reaching another body of water. Small rivers can be referred to using names such as streams, creeks, brooks, and rills.