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"coastline" is also used as a crossword clue. If that's what you saw, the answer is often seaboard (8 letters).
Definitions
the outline or edge of land along the sea
Word origin
From coast + line.
Used in a sentence
“The sweep of the rocky Southern California coastline off Point Fermin.”
“With the sea below us grey and storm swept, and the coast line vague in the driving rain, we forged our way up the bank to breast the summit at 37 m.p.h.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer6 curated clues
01“Shore edge”9 letters
02“Outline along a shore”9 letters
03“Outline of a shore”9 letters
04“Shape of a shore”9 letters
05“Shore outline”9 letters
06“Shoreline shape”9 letters
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