sand bars
The soil deposited at the mouth of a river is called silt.
That is called a river 'delta'.
Delta
A Delta is formed
Delta
The river runs however long, all the while picking up sediment, sand, rocks, etc. and continue doing this for the river's length, and at the very end of the river (mouth), all of this sediment is deposited, leaivng sand at the river mouth.
no, its the flood plain
The earth and sand deposited there are called "sediments" and they build up to form what is called a "delta"; a triangular wedge shaped like the Ancient Greek letter "D" - hence "delta".
It is formed from the silt, sand and small rocks that flow downstream in the river and are deposited in the delta.
Highly fertile silt. The structure of the soil particles is like sand.
an alluvial fan