estuary

US /ˈes.tu.er.i/
UK /ˈes.tu.er.i/
"estuary" picture
1.

the tidal mouth of a large river, where the tide meets the stream

:
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Many species of fish and birds thrive in the rich ecosystem of the estuary.
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The ship sailed slowly up the estuary towards the port.
:
firthfjordinletbaycove