It is called the mouth of the river.
No. An estuary is aplace where two rivers or streams meat. NO. An estuary is the place where a river meets the sea
The Estuary Delta
Estuary
As far as I know, A river's mouth is simply called the 'river mouth'!
The place where the river begins is called a source.
This is called the River Plate.
A river usually ends by flowing into an ocean, a lake or a bigger river. The place where the river flows out into a bigger body of water is called the "mouth" of the river.
Estuary
Estuary
estuary
It is known as the river's estuary.
The place where a river will widen and join into the sea is called a delta. This is the area where a river offloads its water and silt contents.