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US Code of Federal Regulations PRESIDENTIAL PROCLAMATION 5928 OF DECEMBER 27, 1988 THE TERRITORIAL SEA OF THE UNITED STATES OF AMERICA 

PRESIDENTIAL PROCLAMATION 5928 OF DECEMBER 27, 1988 
THE TERRITORIAL SEA OF THE UNITED STATES OF AMERICA 
Acronym: Reagan Proclamation 
Citation: 54 Fed. Reg. 777 (January 9, 1989). 
Executive Purpose: 
The Proclamation extends the territorial sea of the United States to 12 nautical miles from the baselines of 
the United States in accordance with international law. 
Summary: 
President Reagan’s Proclamation on the Territorial Sea ended one of the major anomalies in recent 
international law -- the U.S. reluctance to extend its sovereignty over its territorial sea, that area claimed 
as an extension of the mainland, with the coastal nation claiming jurisdiction over the resources and 
submerged lands and the right to enforcement in the area, beyond three miles from its shore. 
The significance of President Reagan’s Proclamation on the Territorial Sea is best understood in an 
historical context. Thomas Jefferson, as Secretary of State to George Washington, first expressed the 
United States' adoption of a three-mile limitation of a territorial sea in a 1793 letter. Over 100 years later, 
Jefferson's letter influenced the U.S. Supreme Court to adopt the three-mile limit for the U.S. territorial sea. 
The United States relied upon such delimitation for almost 200 years until President Reagan's 1988 decision 
to expand the U.S. territorial sea to twelve miles. 
International attempts to define the limits of the territorial sea failed and, consequently, the territorial sea 
remained at three nautical miles for the United States. However, national practice had begun to diverge 
from this limit and it soon became customary international law to recognize a larger territorial sea and by 
1960, many nations unilaterally claimed a twelve-mile limit. Many nations viewed the three-mile limit 
inadequate because it did not contain enough resources to be allocated authoritatively within such a 
relatively small limit. 
By proclaiming a 12-mile territorial sea, Reagan brought the United States in conformity with the 1982 
United Nations Convention on the Law of the Sea which suggests that every nation endorse a twelve-mile 
territorial sea limit, even though the U.S. has still not ratified the treaty. 
The 1988 Proclamation distinguished between an international boundary where U.S. sovereignty ends and 
a boundary that determines property rights between the U.S. federal and state governments. Under the 
Submerged Lands Act, state property boundaries are presently at the three-mile mark for most states. The 
1988 Proclamation did not amend or alter the SLA, but did extend the U.S. sovereignty boundary from 
three to twelve miles for international purposes. This sovereignty includes jurisdiction over the airspace, 
sea, seabed, and subsoil. 


FEDERAL REGISTER Proclamation 5928 of December 27, 1988 
Title 3 -- The President Territorial Sea of the United States of America 
54 Fed. Reg. 777 January 9, 1989 
A Proclamation 
International law recognizes that coastal nations may exercise sovereignty and jurisdiction over their 
territorial seas. 
The Territorial sea of the United States is a maritime zone extending beyond the land territory and internal 
waters of the United States over which the United States exercises sovereignty and jurisdiction, a 
sovereignty and jurisdiction that extend to the airspace over the territorial sea, as well as to its bed and 
subsoil. 
Extension of the territorial sea by the United States to the limits permitted by international law will advance 
the national security and other significant interests of the United States. 
Now, THEREFORE, I, RONALD REAGAN, by the authority vested in me as President by the 
Constitution of the United States of America, and in accordance with international law, do hereby proclaim 
the extension of the territorial sea of the United States of America, the Commonwealth of Puerto Rico, 
Guam, American Samoa, the United States Virgin Islands, the Commonwealth of the Northern Mariana 
Islands, and any other territory or possession over which the United States exercises sovereignty. 
The territorial sea of the United States henceforth extends to 12 nautical miles from the baselines of the 
United States determined in accordance with international law. 
In accordance with international law, as reflected in the applicable provisions of the 1982 United 
Convention on the law of the Sea, within the territorial sea of the United States, the ships of all contries 
enjoy the right of innocent passage and the ships and aircraft of all countries enjoy the right of transit 
passage through international straits. 
Nothing in this Proclamation: 
(a) extends or otherwise alters existing Federal or State law or any jurisdiction, rights, legal interests, orobligations derived therefrom; or 
(b) impairs the determination, in accordance with international law, of any maritime boundary of the UnitedStates with a foreign jurisdiction. 
IN WITNESS WHEREOF, I have hereunto set my hand this 27th day of December, in the year of our 
Lord nineteen hundred and eighty-eight, and of the Independence of the United States of America the two 
hundred and thirteenth. 
WHITE HOUSE, 
Ronald Reagan