Estuary.
The name given to soil deposited at the mouth of a river is called silt. The mouth of a river is called a delta.
Creek
it is called the mouth of the river
Yangzi River.
meadow; head of a river; river bottom; land of tomorrow.
Source
pooo
a dunce possibly
Small river.
That is his real name given to him at birth by his parents.
South Pole
77