An estuary is a semi-enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea.
Estuaries are often associated with high rates of biological productivity.
The key feature of an estuary is that it is a mixing place for sea water and fresh water to supply fresh water.
A tide is a necessary force to maintain a dynamic relationship at the meeting between the two waters.
In non-tidal seas, rivers naturally form deltas or liman.
In eastern Canada, the Saint Lawrence River widens into the Gulf of Saint Lawrence, the world's largest estuary.
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