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Coast

A coastline or seashore is the area where land meets the sea or ocean.^[1] A precise line that can be called a coastline cannot be determined due to the dynamic nature of tides. The term "coastal zone" can be used instead, which is a spatial zone where interaction of the sea and land processes occurs.^[2] Both the terms coast and coastal are often used to describe a geographic location or region; for example, New Zealand's West Coast, or the East and West Coasts of the United States.


http://en.wikipedia.org/wiki/Coast