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: –USA Today Crossword – Sep 2 2020
Newsday.com Crossword – May 3 2020
Newsday.com Crossword – Jan 29 2019
Newsday.com Crossword – Aug 13 2018
The Washington Post Crossword – July 11 2018
LA Times Crossword 11 Jul 2018, Wednesday

Random information on the term “DELTA”:

Delta (uppercase Δ, lowercase δ or ; Δέλτα Délta; Modern Greek [ˈðelta]) is the fourth letter of the Greek alphabet. In the system of Greek numerals it has a value of 4. It was derived from the Phoenician letter dalet , Letters that come from delta include Latin D and Cyrillic Д.

A river delta (originally, the Nile River delta) is so named because its shape approximates the upper-case letter delta (the shape is a triangle). Despite a popular legend, this use of the word delta was not coined by Herodotus.

In Ancient Greek, delta represented a voiced dental plosive /d/. In Modern Greek, it represents a voiced dental fricative /ð/, like the “th” in “that” or “this”. It is romanized as d or dh.

The upper-case letter Δ can be used to denote:

The lower-case letter δ (or ) can be used to denote:

These characters are used only as mathematical symbols. Stylized Greek text should be encoded using the normal Greek letters, with markup and formatting to indicate text style.

DELTA on Wikipedia