Crossword Genius

___ Formosa (barrier island system of Portugal) (3)

Ross

I believe the answer is:

ria

(Other definitions for ria that I've seen before include "Long narrow inlet" , "Submerged valley" , "Irish academy for sciences and humanities, in short" , "Flooded valley" , "Coastal inlet" .)

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