River - Wikipedia
https://en.wikipedia.org/wiki/River
OverviewTopographyTypes and ratingsStreamflowEcosystemUsesManagementConcernsA river is a natural flowing watercourse, usually freshwater stream, flowing on the surface or inside caves towards another waterbody at a lower elevation, such as an ocean, sea, bay, lake, wetland or another river. In some cases, a river flows into the ground or becomes dry at the end of its course without reaching another body of water. Small rivers can be referred to using names such as creek, brook
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