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coastline

American  
[kohst-lahyn] / ˈkoʊstˌlaɪn /

noun

  • coastlines
    plural
  1. the outline or contour of a coast; shoreline.

  2. the land and water lying adjacent to a shoreline.


coastline British  
/ ˈkəʊstˌlaɪn /

noun

  1. the outline of a coast, esp when seen from the sea, or the land adjacent to it

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

Noun Inflected Forms


Etymology

Origin of coastline

First recorded in 1855–60; coast + line 1


Vocabulary lists containing coastline

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Much of the California coastline is under coastal flood advisories beginning Sunday, with minor to moderate flooding expected due to “historically high tides,” Thompson said.

From Los Angeles Times ● Oct. 25, 2026

The options are not attractive: avoid vast swaths of coastline, or live with a poorly understood risk.

From Science Daily ● Oct. 19, 2026

The group also controls Yemen’s coastline along the Bab al-Mandeb Strait, a key route for Saudi oil exports, according to the report.

From The Wall Street Journal ● Oct. 19, 2026

These shuttle ships use a route close to Oman's coastline.

From BBC ● Oct. 16, 2026

They speak of Uhmma’s early years gathering and drying fish along the Korean coastline.

From "A Step from Heaven" by An Na

The most significant effects are expected along Orange and San Diego counties’ coastlines this week, where the high tides are forecast to cause localized flooding, more coastal erosion and other hazards.

From Los Angeles Times ● Oct. 25, 2026

Kelvin waves are totally natural, forming throughout the year from warming ocean water and usually not impacting coastlines by a noticeable amount.

From Salon ● Oct. 22, 2026

The satellite's ocean and land color instrument has already delivered detailed images of landscapes and coastlines, while its radar altimeter has produced encouraging measurements of ocean and ice sheet elevations.

From Science Daily ● Oct. 12, 2026

Based on the latest projections, the coastlines of Alabama and Mississippi could be the most affected, Molchanov noted.

From MarketWatch ● Oct. 9, 2026

I was awed by the immense beauty of South Africa, seen from high up in the clouds: rolling hills and plains, meandering rivers and mountain ranges, thick forests, magnificent coastlines, luscious farmland.

From "Kaffir Boy: An Autobiography" by Mark Mathabane

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