Delta
an Estuary
it is an estuary. This is also called a river mouth and delivers the spring water to the sea.
mouth
The mouth of a river is where it empties into another river, a lake, a sea, or an ocean.
mouth
The mouth of a river is where the river flows into another body of water, such as an ocean, sea, lake, or another river. It is typically wider than the rest of the river and marks the end of the river's journey. At the mouth, the velocity of the river's flow decreases, leading to sediment deposition.
Generally, the mouth of a river is found where it empties into another river, a lake, reservoir or ocean. A large river's mouth can cover a massive area.
Tributary. The Missouri river is a tributary of the Mississippi river.
The name given to soil deposited at the mouth of a river is called silt. The mouth of a river is called a delta.
Usually it would be an estuary.
Delta.
Delta