coast line

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
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Etymonline
Word Origin & History

coastline
1860, from coast + line (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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