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
This technology has global implications well beyond Florida’s coastline.
—
Mrigakshi Dixit,
Interesting Engineering,
3 July 2026
Walks along the coastline, mountain hikes, biking, kayaking and canoeing and narrated boat cruises are all favorite pastimes at Acadia.
—
Andrea Margolis,
FOXNews.com,
3 July 2026
According to the letter writer, the sea lions living and reproducing pups in the safety of La Jolla Cove should just go somewhere else along the very long California coastline.
—
U T Readers,
San Diego Union-Tribune,
2 July 2026
In Rio de Janeiro, that very scenario is playing out on their coastline.
—
Melissa Cristina Márquez,
Forbes.com,
2 July 2026
See All Example Sentences for coastline
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Mrigakshi Dixit,
Interesting Engineering,
3 July 2026
Walks along the coastline, mountain hikes, biking, kayaking and canoeing and narrated boat cruises are all favorite pastimes at Acadia.
—
Andrea Margolis,
FOXNews.com,
3 July 2026
According to the letter writer, the sea lions living and reproducing pups in the safety of La Jolla Cove should just go somewhere else along the very long California coastline.
—
U T Readers,
San Diego Union-Tribune,
2 July 2026
In Rio de Janeiro, that very scenario is playing out on their coastline.
—
Melissa Cristina Márquez,
Forbes.com,
2 July 2026
See All Example Sentences for coastline
Cite this Entry
“Coastline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/coastline. Accessed 5 Jul. 2026.
Copy CitationKids Definition
coastline
noun
coast·line
ˈkōst-ˌlīn
: the outline or shape of a coast
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