coastline

[kohst-lahyn]
noun
1.
the outline or contour of a coast; shoreline.
2.
the land and water lying adjacent to a shoreline.

Origin:
1855–60; coast + line1

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World English Dictionary
coastline (ˈkəʊstˌlaɪn)
 
n
the outline of a coast, esp when seen from the sea, or the land adjacent to it

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

coastline
1860, from coast + line (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The dictator of a country with a lot of coastline is killing his people.
Merely a lucky orientation of the coastline and the epicenter of the quake.
The water that is moved by the energy is also affected by gravity, explaining
  the flat body of water that hits a coastline.
He wouldn't be needing them because he would be following the coastline south.
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