Estuary.
At the mouth of the river, when it abruptly widens and meets the sea.
Idkk ansswer it yourselfs! LAZY MUCHH!?
The mouth is the part of a river of stream where it meats a sea or ocean.
When one river meets another, it is called a tributary.
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.
The mouth, or the estuary, where it meets the ocean.
No, an estuary is where a river widens and flows into the sea.
The river Delta. Like the Nile River Delta.
It widens the valley
Where freshwater mixes with seawater, and the river usually widens out, is the river estuary.
It is erosion by flowing water, especially when the river is in spate, that can widen the river's banks.
Please rephrase - the question is unclear.