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

Forecasters also say the high surf and rough ocean conditions that rattled coastlines from Malibu to San Diego over the last week are expected to calm. — Grace Toohey, Los Angeles Times, 11 Sep. 2026

Cycle along the coastline, set sail across the Mediterranean, dive with certified instructors, explore on horseback, or pick up a racket for a game of tennis or padel. — Condé Nast, Condé Nast Traveler, 10 Sep. 2026

Already, the Houthis control Yemen’s capital, swaths of the country’s northwest, and much of its Red Sea coastline north of the island. — Nic Robertson, CNN Money, 10 Sep. 2026

All that fruit grown alongside coffee plants, in addition to topography ranging from snowcapped peaks to Caribbean coastline, brings out distinct flavor profiles. — Nikkita Nair, Saveur, 10 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