Seaboard

Full definition of seaboard

Noun

1. The area bordering the sea; a coastline.
• 1948, Carey McWilliams (journalist), North from Mexico
  The Spanish-Speaking People of The United States, J. B. Lippincott Company, page 25,While De Anza was exploring the Bay of San Francisco, seeking a site for the presidio, the American colonists on the eastern seaboard, three thousand miles away, were celebrating the signing of the Declaration of Independence.

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