coast·​line | \ ˈkōs(t)-ˌlīn How to pronounce coastline (audio) \

Definition of coastline

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 camper will be available to rent on June 24, June 25 and June 26 for $20 a night off the Southern California coastline, Airbnb said in a news release. Saleen Martin, USA TODAY, 9 June 2022 Agatha was located about 200 miles off the coastline of Puerto Angel, Mexico, on Sunday morning, where conditions are favorable for the storm to strengthen further. Jason Samenow, Washington Post, 29 May 2022 The Biden administration canceled plans to auction drilling rights in three regions off the U.S. coastline later this year, adding more friction to an uneasy relationship with the oil industry. WSJ, 13 May 2022 There have been numerous records set from the Great Lakes to Texas, we have been spared the heat as that pesky storm system that was off the coastline kept the warmth from reaching Eastern Massachusetts. Dave Epstein,, 13 May 2022 Reese: In putting their heads together, scientists and offshore wind companies hope to make watching out for whales and other marine wildlife part of the industry's M.O. as turbines multiply off the U.S. coastline. Scientific American Custom Media, Scientific American, 20 Jan. 2022 The fish are usually not seen for miles off the coastline. NBC News, 13 Dec. 2021 Earlier this month, a diver found a 900-year-old Crusader sword off the Israeli coastline. Maureen O'hare, CNN, 30 Oct. 2021 No new offshore oil drilling has been approved in federal waters off the state coastline since 1984. Los Angeles Times, 18 Oct. 2021 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'coastline.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of coastline

1856, in the meaning defined at sense 1

Learn More About coastline

Time Traveler for coastline

Time Traveler

The first known use of coastline was in 1856

See more words from the same year

Dictionary Entries Near coastline

coast lily


coast live oak

See More Nearby Entries 

Statistics for coastline

Last Updated

8 Aug 2022

Cite this Entry

“Coastline.” Dictionary, Merriam-Webster, Accessed 13 Aug. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Odd Habits and Quirks

  • image1926873504
  • Which of the following best describes an easily irritated person?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!