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

Ultimately, this wasn’t an ordinary footprint, but direct evidence that humans were present along the Angus coastline during the late Iron Age, preserving both a physical imprint and an ecological snapshot of the land from two millennia ago. —Maria Mocerino, Interesting Engineering, 21 Feb. 2026

Another 45-mile stretch is open from Monterey south to just north of the closure, allowing access to much of the Big Sur coastline. —Bay City News Service, Mercury News, 21 Feb. 2026

Riders will travel through downtown Fort Lauderdale, along Fort Lauderdale Beach and through Birch State Park before riding along the coastline back toward Hard Rock Stadium. —Cbs Miami Team, CBS News, 21 Feb. 2026

With only 60 residential sites planned along miles of unspoiled coastline, opportunities to buy into the community remain scarce. —Abby Montanez, Robb Report, 20 Feb. 2026

Word History

First Known Use

1856, in the meaning defined at sense 1

Rhymes for coastline

• affine
• airline
• align
• aline
• assign
• baseline
• beamline
• benign
• bloodline
• bovine
• byline
• canine

Kids Definition

coastline

noun

coast·​line ˈkōst-ˌlīn 

: the outline or shape of a coast