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Ria is a long narrow inlet.
Fjord .
Could be a Cove
slough
The word is ria. It means a long, narrow inlet.
Ria
ria
sound
Ria
The word Mollusk is a 7 letter word.
Arm (of the sea) or bay can be used to describe a narrow inlet, although a bay can be up to 24 nautical miles wide.
an inlet