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A river delta is a landform where the mouth of a river flows into an ocean, sea, desert, estuary, lake or another river. It is formed by sediment carried by the river being deposited in the wider mouth. This happens because the water moves less quickly there.
A river delta can cover just a few square miles, or an area of hundreds or thousands of square miles of land.
Other websites[change | change source]
- Louisiana State University Geology - World Deltas