Question

what is a costal area? how it is different from an estuary​

Answer 1

The coast, also known as the coastline or seashore, is the area where land meets the sea or ocean, or a line that forms the boundary between the land and the ocean or a lake.
whereas,
Estuary, partly enclosed coastal body of water in which riverwater is mixed with seawater. In a general sense, the estuarine environmentis defined by salinity boundaries rather than by geographic boundaries.
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Answer 2

Heya ¡

Coastal area : They are commonly defined as the interface or transition areas between land and sea, including large inland lakes.

But an estuary is enclosed coastal body brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. 



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