Crossword Genius

River mouth landform (5)

Ross

I believe the answer is:

delta

(Other definitions for delta that I've seen before include "Mouth of, eg, the Nile" , "one's often seen at mouth of river" , "Dealt (anag.)" , "Spreading river mouth" , "Fourth Greek letter? - area at river mouth" .)

I've seen this clue in the USA Today.
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