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 report pointed to Storm Louis in 2024, which brought 26-foot waves to parts of Spain’s coastline, causing one death, widespread power outages and damage to infrastructure. — Laura Paddison, CNN Money, 30 Sep. 2026

The rescue operation was the latest in a series of anti-piracy operations along Puntland’s coastline. — ABC News, 30 Sep. 2026

At almost twice the size of the UK but with a population density 90% lower, Sweden is a land of open landscapes and wild coastline. — Natasha Langan, TheWeek, 29 Sep. 2026

The slow-moving nor’easter battered the Northeast coastline with heavy rain, strong winds and dangerous surf, flooding low-lying communities from New Jersey to New England. — Leah Willingham, Los Angeles Times, 29 Sep. 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