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Coastline

(1) The line that forms the boundary between the coast and the shore and marks the seaward limit of the permanently exposed coast. (2) The U. S. National Ocean Survey uses the terms coastline and shoreline as synonyms and defines them as being the line of mean high water. (3) The U. S. Submerged Lands Act, 43 U. S. C. 1301(c), states that the term coast line means the line of mean low water along that portion of the coast which is in direct contact with the open sea and the line marking the seaward limit of inland waters. (4) A narrow strip of land adjacent to the line separating the surfaces of land and water at the edge of a sea or ocean. This last definition is used in civil engineering and is best not used at all. Use coast instead.

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