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 is due to strong angler demand, easy access to saltwater and solid infrastructure, along with a strong variety of fish residing along the state's prominent coastline. —Lexi Lane, PEOPLE, 30 May 2026

Its 60-mile coastline offers both bustling boardwalks and quieter spots like Surfside Beach, which is ideal for families. —Dave Parfitt, USA Today, 30 May 2026

There’s forty miles of beautiful, beautiful coastline. —AFAR Media, 30 May 2026

With its picturesque towns built into the cliffs, dramatic rocky coastline, and glamorous resorts, the Amalfi Coast tends to steal the spotlight, but just south of it lies Cilento, an area full of rugged beauty within the southern part of the Campania region bordering Basilicata. —Laura Itzkowitz, Travel + Leisure, 30 May 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
• brucine
• byline

Kids Definition

coastline

noun

coast·​line ˈkōst-ˌlīn 

: the outline or shape of a coast