Of or pertaining to a coast or shore.

adjective. Of or pertaining to a coast.

adjective. relating to the coast; on or near the coast, as a coastal town, a coastal breeze

adjective. of or relating to a coast

adjective. located on or near or bordering on a coast

"Despite excluding a “worst-case” scenario of polar ice sheet loss, researchers report that “nearly 500,000 people and $100 billion worth of property in coastal California are at risk of severe flooding from rising sea levels this century.”"

belted coastal plain  coastal plain  embayed coastal plain  

coastwise  inshore  maritime  seaward  

bicoastal  postal  

Baltic  adjacent  arid  eastern  extensive  

bordering  borderline  boundary  bounding  determinant