Justice Ginsburg, delivered the opinion of the Court.
The Piscataqua River lies at the southeastern end of New Hampshire's boundary with Maine. The river begins at the headwaters of Salmon Falls and runs seaward into Portsmouth Harbor (also known as Piscataqua Harbor). On March 6, 2000, New Hampshire brought this original action against Maine, claiming that the Piscataqua River boundary runs along the Maine shore and that the entire river and all of Portsmouth Harbor...
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