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

Kalivia, about an hour outside Athens, is near some of my favorite beaches along the Attica coastline, like Chamolia and Vravrona. —Katherine Whittaker, Saveur, 9 Oct. 2025

Another new addition to the view is the coastal railway line built during the Mandatory period now reopened from Haifa to Beirut in which a bullet train can be seen speeding along the coastline. —Literary Hub, 7 Oct. 2025

The accommodations offer resort, coastline, or ocean views; king or double queen beds; balconies or ground-level patios; and optional Club level. —Patricia Doherty, Travel + Leisure, 7 Oct. 2025

Across the county, conservation and local culture define the character of this 22 miles stretch of coastline. —Kelsey Glennon, Southern Living, 3 Oct. 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