Cite as: 521 U. S. 1 (1997)
Opinion of the Court
feature remained above mean high water until "ice collapse" caused it to slump, that would not compel a ruling in Alaska's favor. Although Article 10(1)'s drafting history may suggest that a feature submerged at abnormally high tides does not lose its insular status, it does not support the broader conclusion that a feature with a seasonal loss in elevation, bringing it below mean high water, qualifies as an island. See supra, at 27.
In sum, we find no error in the Master's conclusion that Dinkum Sands is frequently below mean high water and therefore does not meet the standard for an island.
C
Alaska finally urges a compromise resolution, under which Dinkum Sands would be deemed an island when above mean high water. Alaska attempts to find support for its position in this Court's recognition in prior cases of the concept of an "ambulatory coast line." Alaska Exceptions Brief 55. In adopting the 1958 Convention to aid interpretation of the Submerged Lands Act, we recognized that the Convention treats a nation's coastline as its modern, ambulatory coastline. See United States v. Louisiana, 394 U. S. 1, 5 (1969) (Texas Boundary Case); Louisiana Boundary Case, 394 U. S., at 32-34. Shifts in a low-water line along the shore, we acknowledged, could lead to a shift in the baseline for measuring a maritime zone for international purposes. In turn, the State's entitlement to submerged lands beneath the territorial sea would change.
An island may very well have its own ambulatory coastline. What Alaska seeks here, however, is not an entitlement to submerged lands seaward of a gradually accreting or eroding shore. Rather, Alaska's ownership of submerged lands around Dinkum Sands would appear and disappear periodically, depending upon whether the feature was above or below mean high water. Not only does Article 10(1) of the Convention not support such a reading, but Alaska's position
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