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territorial waters

plural noun
the waters of a littoral state that are regarded as under the jurisdiction of the state: traditionally those waters within three miles (4.8 km) of the shore, but in the 20th century claims by coastal nations have extended to 12 or even 200 miles (19.3 or 321.8 km).
Also called marine belt.
Compare high sea (def 1).
Origin of territorial waters
1870-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for territorial-waters

territorial waters

plural noun
the waters over which a nation exercises jurisdiction and control
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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