Answer :
The silt carried by a river is dumped in a fan-shaped structure known as a delta where it meets the sea. Sand bars, spits, and barrier islands are examples of shoreline sediment structures that are formed as a result of the silt being picked up and transported by longshore drift.
When rivers discharge their water and sediment into another body of water, such as the ocean, a lake, or another river, wetlands known as deltas occur. Deltas can also drain into land, though this is extremely unusual. The closer a river gets to its mouth or finish, the slower it flows. Sediment, or solid material transported downstream by currents, is subsequently deposited at the river's bottom as a result.
Subaerial and subaqueous regions can be separated into separate portions of a delta. A delta's subaqueous region is submerged. This area of the delta slopes the steepest and has the purest silt. The pro delta is the newest region of the subaqueous delta and is located farthest from the river's mouth.
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