An estuary is a place where a freshwater stream meets the ocean. This estuary is formed where the Parker River meets the Atlantic Ocean in Parker River National Wildlife Refuge, Massachusetts.

Photograph by Kim D. Pickard, MyShot

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estuary Encyclopedic Entry

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Geography, Science

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An estuary is an area where a freshwater river or stream meets the ocean. When freshwater and seawater combine, the water becomes brackish, or slightly salty.