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Three-mile limit
The three-mile Limit refers to a traditional and now largely obsolete conception of the international law of the seas which defined a country's territorial waters, for the purposes of trade regulation and exclusivity, as extending as far as the reach of cannons fired from land. (Improvements in cannons eventually allowed them to be able to fire a shell more than three miles, but Earth's curvature made this moot. From a height of a few meters above sea level (say, atop the wall of a coastal fort), the horizon is only about three miles (5 km) away. Thus there was no need to be able to shoot farther, since more distant targets would not be visible.)
In ''Mare clausum'' (1635) John Selden endeavoured to prove that the sea was in practice virtually as capable of appropriation as terrestrial territory. As conflicting claims grew out of the controversy, maritime states came to modulate their demands and base their maritime claims on the principle that it extended seawards from land. A workable formula was found by Cornelius Bynkershoek in his ''De dominio maris'' (1702), restricting maritime dominion to the actual distance within which cannon range could effectively protect it. Most maritime nations adopted this principle, which developed into a limit of three nautical miles. (It has also been suggested that the three-mile limit derived, at least in some cases, from the general application of the league (a common unit of measurement at sea) rather than from the range of cannon.)
Since the mid-20th century, numerous nations have claimed territorial waters well beyond the traditional three-mile (5 km) limit. Commonly these maritime territories extend from a coastline, and this was eventually established as the international norm by the 1982 United Nations Convention on the Law of the Sea. As a result, the three-mile limit has become largely obsolete. , only Gibraltar, Jordan, Palau, and Singapore retain it.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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