Gulf Coast habitat (5)

I believe the answer is:

bayou

(Other definitions for bayou that I've seen before include "Marshy tributary of lake or river - a buoy (anag)" , "marshy water in New Orleans?" , "AB, you could be in a marshy Louisiana inlet" , "US marshy delta, eg Mississippi" , "Marshy outlet" .)

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

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