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territorial waters

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plural noun
  1. 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).
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Compare high sea(def 1).

Origin of territorial waters

First recorded in 1870–75
Also called marine belt.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for territorial waters

territorial waters

pl n
  1. the waters over which a nation exercises jurisdiction and control
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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