Crossword Genius

Some rivers have them (6)

Ross

I believe the answer is:

deltas

(Other definitions for deltas that I've seen before include "Triangular land patches at river mouths" , "Coastal features" , "Triangular islands at mouths of rivers" , "Estuaries" , "Triangular patches of land at mouths of rivers" .)

I've seen this clue in The New York Times.
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