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 people live on coastlines.
—
Sheri Bachstein, Time, 18 Sep. 2025
Özçelik and colleagues spent two weeks in June 2022 surveying 10 muddy sites along the existing coastlines by foot.
—Andrew Paul, Popular Science, 18 Sep. 2025
Richard Gabriel Moritz | Unsplash Many readers will know this coastline—which arcs its way from the French border in the west to Tuscany in the east, via the ancient port city of Genoa—for the five absurdly picturesque villages of the Cinque Terre.
—Spencer Elliott, Forbes.com, 17 Sep. 2025
Starship’s launch pad is along the Texas coastline, less than 5 miles from the Mexico border, surrounded by a state park and a national wildlife refuge established to protect the biodiversity of the lower Rio Grande River.
—Taylor Kate Brown, ProPublica, 17 Sep. 2025
See All Example Sentences for coastline
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Sheri Bachstein, Time, 18 Sep. 2025
Özçelik and colleagues spent two weeks in June 2022 surveying 10 muddy sites along the existing coastlines by foot.
—Andrew Paul, Popular Science, 18 Sep. 2025
Richard Gabriel Moritz | Unsplash Many readers will know this coastline—which arcs its way from the French border in the west to Tuscany in the east, via the ancient port city of Genoa—for the five absurdly picturesque villages of the Cinque Terre.
—Spencer Elliott, Forbes.com, 17 Sep. 2025
Starship’s launch pad is along the Texas coastline, less than 5 miles from the Mexico border, surrounded by a state park and a national wildlife refuge established to protect the biodiversity of the lower Rio Grande River.
—Taylor Kate Brown, ProPublica, 17 Sep. 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 24 Sep. 2025.
Copy CitationKids Definition
coastline
noun
coast·line
ˈkōst-ˌlīn
: the outline or shape of a coast
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