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

Just 30 minutes from Athens city center, this 40-mile stretch of coastline is undergoing a resurgence, driven by the completion of Europe's most extensive coastal park, planned for the end of 2025, and a raft of the most fabulous hotel chains setting up home. —Alex Ledsom, Forbes, 25 Feb. 2025

The former features a 39-foot, golden Buddha at the top of the stairs along with panoramic vistas of the coastline. —Christina Liao, Vogue, 21 Feb. 2025

The Palmetto State is probably best known for its unofficial Southern capital of Charleston, but its 187 miles of coastline are a close second. —Symiah Dorsey, Southern Living, 21 Feb. 2025

Activities and Experiences The resort spans 1,300 acres of stunning coastline with seven beautiful beaches, trails, and abundant natural beauty. —Dyana Lederman, Travel + Leisure, 19 Feb. 2025

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