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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 12 nautical miles from the baseline (usually the mean low-water mark) of a coastal state. Territorial waters differ from the high seas, which are common to all nations and are governed by the principle of freedom of the seas. The high seas are not subject to appropriation by persons or states but are available to everyone for navigation, exploitation of resources, and other lawful uses. The legal status of territorial waters also extends to the seabed and subsoil under them and to the airspace above them.