20
Opinion of the Court
concerning straits leading to inland waters. As discussed supra, at 18-19, a rule applying 10-mile bay-closing principles to straits leading to inland waters would not always lead to the same result as a simple 10-mile rule. Under the former approach, the critical factor is where the strait leads, not the width of the strait. Alaska does not attempt to show that Stefansson Sound is a strait leading to inland waters.
Nor does the 1950 Chapman Line reflect a "firm and continuing" policy of enclosing waters behind fringing islands as "inland waters." The Chapman Line may be consistent with such a policy, but as the Master noted, no contemporaneous document explains the theory behind the Chapman Line in terms of a simple 10-mile rule. Report 85-88. Indeed, a 1950 draft memorandum from the State Department Geographer to the Justice Department opined that Chandeleur and Breton Sounds should be treated as inland waters not only because they were screened by a chain of islands that were less than 10 miles apart, but also because they were "not extensively traversed by foreign vessels" and because the islands covered "more than half the total arc of the territorial sea." U. S. Exh. 85-400. These criteria go far beyond the simple 10-mile rule, and Alaska does not show how they would apply to Stefansson Sound. Finally, statements in the briefs filed by the United States in litigation with the Gulf States that certain waters behind offshore islands were inland waters do not explicitly rely on a 10-mile rule. Moreover, in our decision in United States v. Louisiana, 363 U. S. 1, 67, n. 108 (1960), we made clear that we did not take the Government's concession that certain islands off Louisiana's shore enclosed inland waters "to settle the location of the coastline of Louisiana or that of any other State."
These and other documents considered by the Master support his conclusion that Alaska has not identified a firm and continuing 10-mile rule that would clearly require treating the waters of Stefansson Sound as inland waters at the time
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