Reference Terms
from Wikipedia, the free encyclopedia

Estuary

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.

Note:   The above text is excerpted from the Wikipedia article "Estuary", which has been released under the GNU Free Documentation License.
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September 4, 2015

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