River-mouth formation

This time we are looking on the crossword clue for: River-mouth formation.
it’s A 21 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: DELTA.

Last seen on: –Newsday.com Crossword – May 14 2019
Newsday.com Crossword – Feb 27 2019
Newsday.com Crossword – Nov 21 2018