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

Log Slide Overlook The short hike to Log Slide Overlook offers landlubbers one of the best options to experience Pictured Rocks’ stunning coastline and connect to other, longer trails. —Robert Annis, Midwest Living, 21 June 2026

Khalil trained a generation of volunteers in ecological conservation, protecting the Mediterranean coastline and the endangered sea turtles that travel hundreds of miles to return to the same beaches where they were hatched to lay their eggs. —Jane Arraf, NPR, 21 June 2026

What really matters, especially on this sensitive coastline, is whether that balance is kept, not just how the designs look. —Jim Dobson, Forbes.com, 21 June 2026

Comprising three acres with direct access to a sandy beach on Staples Cove, the Cape Elizabeth property sits along a particularly picturesque stretch of Maine’s coastline. —Abby Montanez, Robb Report, 20 June 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