coastline
noun
coast·line
ˈkōs(t)-ˌlīn 
1
: a line that forms the boundary between the land and the ocean or a lake
2
: the outline of a coast
Examples of coastline in a Sentence
The plane flew along the eastern coastline.
Recent Examples on the Web
More than half of New Jersey's coastline is still at risk of major flooding, the most severe classification through the National Oceanic and Atmospheric Administration (NOAA), amid a vicious coastal storm battering the East Coast.
—
Kate Plummer, MSNBC Newsweek, 14 Oct. 2025
The widespread collapse of reef ecosystems would be devastating for marine and human life— reefs help support fisheries, and protect coastlines from storm surges and rising sea levels.
—Simmone Shah, Time, 12 Oct. 2025
Daniel returns to Italy, the land of his childhood, as a fixer in one of the world’s most luxurious hotels, located on the coastline of Positano.
—Marta Balaga, Variety, 12 Oct. 2025
Oceans and coastlines contain the highest uncertainties of methane release, according to researchers.
—Julia Jacobo, ABC News, 11 Oct. 2025
See All Example Sentences for coastline
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Kate Plummer, MSNBC Newsweek, 14 Oct. 2025
The widespread collapse of reef ecosystems would be devastating for marine and human life— reefs help support fisheries, and protect coastlines from storm surges and rising sea levels.
—Simmone Shah, Time, 12 Oct. 2025
Daniel returns to Italy, the land of his childhood, as a fixer in one of the world’s most luxurious hotels, located on the coastline of Positano.
—Marta Balaga, Variety, 12 Oct. 2025
Oceans and coastlines contain the highest uncertainties of methane release, according to researchers.
—Julia Jacobo, ABC News, 11 Oct. 2025
See All Example Sentences for coastline
Cite this Entry
“Coastline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/coastline. Accessed 21 Oct. 2025.
Copy CitationKids Definition
coastline
noun
coast·line
ˈkōst-ˌlīn
: the outline or shape of a coast
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