A delta.
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The mouth part of a river is called a delta. It is the large silty area at the mouth of a river at which the river spills into different slow flowing channels.
it is an estuary. This is also called a river mouth and delivers the spring water to the sea.
Delta
A river mouth is a portion of a stream where it merges with another stream. Note that here the definition of stream is not "a small river", but "any flowing current within well defined banks."
cataract