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"coastal" is also used as a crossword clue. If that's what you saw, the answer is often littoral (8 letters).
Definitions
located on or near or bordering on a coast
Word origin
From coast + -al. Piecewise doublet of costal.
Used in a sentence
“coastal town”
“coastal breeze”
“coastal elites”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“By the sea”7 letters
02“Near the shore”7 letters
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