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

The wedding venue is a private club on the New England coastline. — Jacobina Martin, Washington Post, 1 Aug. 2026

If cruising the coastline (on two or four wheels) is on your wish list, cars can access the private 17-Mile Drive via multiple gates. — Condé Nast, Condé Nast Traveler, 1 Aug. 2026

At Monarch Bay Beach Club, the coastline becomes an extension of the wellness journey, where guests can paddle across calm waters, learn to surf with expert guidance, or simply spend the afternoon immersed in the restorative presence of the ocean. — Robb Report Studio, Robb Report, 31 July 2026

Nolan also shot in the coves and beaches surrounding Favignana’s coastline and in the nearby tiny islet of Preveto. — Nick Vivarelli, Variety, 31 July 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