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

And few people realize that the country's coastline is actually peppered with over 350 idyllic islands, from picture-perfect Favignana to car-free Panarea to rugged Marettimo. —Nicky Swallow, Travel + Leisure, 17 May 2026

Hernandez's death comes amid a Beach Hazards Statement for the Monterey County coastline this weekend due to high winds, dangerous surf, strong rip currents, rough shore breaks and elevated waves. —Cecilio Padilla, CBS News, 17 May 2026

Naples, Florida Come to Naples for Southwestern Florida charm, a picturesque nine-mile coastline of Gulf Coast views, and outdoor activities like golfing, for which the town offers 90 public and private courses. —Skyli Alvarez, Condé Nast Traveler, 17 May 2026

From remote barrier islands to hidden coastlines, here are the best spots Florida shellers quietly cherish. —Gabi De La Rosa, Southern Living, 17 May 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