coastline
noun B2- The shape, outline, or boundary of a coast. (The term coastline is generally used to describe the approximate boundaries at relatively large spatial scales.) · The sweep of the rocky Southern California coastline off Point Fermin.
Plural coastlines
From the library
The eastern coastline of the newly surveyed peninsula was undeniably inaccurate, curving gracefully inward where it should have protruded outward.
Elara asked if he might kindly explain a complex navigational notation that appeared to contradict the majestic curve of his coastline.
Together, they spent the remainder of the evening carefully scraping away the erroneous ink and charting the true, unvarnished coastline.
Rain lashed relentlessly against the panoramic windows of the passenger lounge, obscuring any faint glimmer of the Welsh coastline.
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