Cite as: 521 U. S. 1 (1997)
Opinion of the Court
coastline should correspond to a normal baseline under Article 3 of the Convention.
For the reasons discussed below, we find no error in the Master's approach.
A
Under the Convention, a nation's past boundary delimitation practice is relevant in a narrow context: specifically, when a nation claims that certain waters are "historic" inland waters under Article 7(6) of the Convention. If certain geographic criteria are met, Article 7(4) of the Convention permits a nation to draw a "closing line" across the mouth of a bay and to measure its territorial sea outward from that line. Waters enclosed by the line are considered internal waters. Article 7(6) also permits a nation to enclose "historic" bays, even if those waters do not satisfy the geographic criteria of Article 7(4). For a body of water to qualify as a historic bay, the coastal nation "must have effectively exercised sovereignty over the area continuously during a time sufficient to create a usage and have done so under the general toleration" of the community of nations. Id., at 102 (citing Juridical Regime of Historic Waters, Including Historic Bays 56, U. N. Doc. A/CN.4/143 (1962)) (internal quotation marks omitted). Accordingly, where a State within the United States wishes to claim submerged lands based on an area's status as historic inland waters, the State must demonstrate that the United States: (1) exercises authority over the area; (2) has done so continuously; and (3) has done so with the acquiescence of foreign nations. See Alabama and Mississippi Boundary Case, supra, at 101-102.
Recognizing these strict evidentiary requirements, Alaska does not contend that the waters of Stefansson Sound are historic inland waters. Alaska does not purport to show any specific assertion by the United States that the waters of Stefansson Sound are inland waters. Rather, Alaska argues that, at the time it was admitted to the Union, the United States had a general, publicly stated policy of enclosing as
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