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As a river reaches the sea its flow becomes slower, forming an area known as a delta. As the water slows the tiny particles of silt carried by the current settle to the bottom, forming mud banks.

These make the river-bed shallower, so the water spreads out to form a wide estuary.

In large rivers like the Danube, islands form among these exposed mud banks, and the river water trickles through a maze of small waterways. This region, which is rich in plants and other wildlife, forms the riv read more...

Tags: water, river

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