DEFINITION OF “COAST” EXTRACTED FROM LAW DICTIONARIES, DIGESTS AND WORKS.
Bouvier's Law Dictionary (Rawle's 3rd rev. : 1914), Vol. 1, p. 507.
COAST : The margin of a country bounded by the sea. This term includes the natural appendages of the territory which rise out of the water, although they are not of sufficient firmness to be inhabited or fortified. Shoals perpetually covered with water are not, however, comprehended under the name of coast. The small islands situate at the mouth of the Mississippi, composed of earth and trees drifted down by the river, which are not of consistency enough for supporting life, and are uninhabited, though resorted to for shooting birds, form a part of the coast.