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Territorial Sea - U.S.-Affiliated Pacifc Islands

Published by Pacific Islands Ocean Observing System (PacIOOS) | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: January 27, 2026 | Last Modified: 2016-01-25T00:00:00.000+00:00
These boundaries represent the territorial sea for U.S.-affiliated Pacific Islands, including Hawaii, American Samoa, the Commonwealth of the Northern Mariana Islands (CNMI), Guam, as well as the U.S. Minor Outlying Islands of Baker Island, Howland Island, Jarvis Island, Johnston Atoll, Kingman Reef, Midway Atoll, Palmyra Atoll, and Wake Island. Territorial waters, or a territorial sea, as defined by the 1982 United Nations Convention on the Law of the Sea, is a belt of coastal waters extending at most twelve nautical miles (12 nmi) from the baseline (usually the mean low-water mark) of a coastal state. The territorial sea is regarded as the sovereign territory of the state, although foreign ships are allowed innocent passage through it; this sovereignty also extends to the airspace over and seabed below.

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