A wide river mouth (5)
I believe the answer is:
delta
(Other definitions for delta that I've seen before include "Coastal feature" , "Area of distributaries at a river mouth" , "Multiple estuary" , "first used by Daedalus" , "Greek character" .)
I believe the answer is:
delta
(Other definitions for delta that I've seen before include "Coastal feature" , "Area of distributaries at a river mouth" , "Multiple estuary" , "first used by Daedalus" , "Greek character" .)