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

From wild coastlines to rainforest revival, Chelsea’s gardens reflect a world in flux. —Lee Sharrock, Forbes.com, 20 May 2025

Blue Stone counters and Thermador appliances trail the space with Sailor Blue cabinetry, too, ahead of an area that seats four by coastline views. —Demetrius Simms, Robb Report, 18 May 2025

Eleven During his weeklong stay there, Bieber shared photos on Instagram of himself riding a heli-skiing, sitting by a campfire, playing ping pong, and walking along the coastline without any sign of another human in sight. —Rachel Chang, Travel + Leisure, 14 May 2025

The Arctic action-thriller was inspired by a Danish special forces unit, known as Sirius Patrol, tasked with defending Greenland’s 8,700-mile frozen and formidable coastline. —Brent Lang, Variety, 13 May 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