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United Nations Convention on the law of the sea :)
Myron H. Nordquist has written:
'What Color Helmet? Reforming Security Council Peacekeeping Mandates'
'The Law of the Sea Convention' -- subject(s): United Nations Convention on the Law of the Sea, Congresses, Law of the sea
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According to the United Nations Convention on the Law of the Sea (1982), it is 12 nautical miles.