Most rivers find their sources, or headwaters, in large and elevated bodies of water such as lakes, springs or glaciers. From the source, it flows downward, following the path of the land's lowest elevation between the source and mouth, or end, of the river. For example, the Mississippi River takes its source water from Lake Itasca in Minnesota and ends at its mouth in the Gulf of Mexico. All rivers flow from a point of higher elevation to a point of lower elevation.
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