coast·​line ˈkōs(t)-ˌlīn How to pronounce coastline (audio)
: a line that forms the boundary between the land and the ocean or a lake
: the outline of a coast

Examples of coastline in a Sentence

The plane flew along the eastern coastline.
Recent Examples on the Web Haitian gangs appear to be using weapons also used by the Gulf Clan, a Colombian cartel, which operates along the country’s Caribbean coastline and uses neighboring countries to traffic cocaine. Maria Abi-Habib, New York Times, 21 May 2024 Mexico Just south of the United States with warm weather, a wide variety of places to live, miles of coastline, and beautiful cities, Mexico is a popular destination for retirees and vacationers. Patricia Doherty, Travel + Leisure, 19 May 2024 See all Example Sentences for coastline 

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'coastline.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1856, in the meaning defined at sense 1

Time Traveler
The first known use of coastline was in 1856

Dictionary Entries Near coastline

Cite this Entry

“Coastline.” Dictionary, Merriam-Webster, Accessed 28 May. 2024.

Kids Definition


coast·​line ˈkōst-ˌlīn How to pronounce coastline (audio)
: the outline or shape of a coast
Last Updated: - Updated example sentences
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