OpenHistoricalMap/Projects/Maritime Boundaries

Overview

The goal is to accurately map all maritime boundaries in order to mop up multiple duplicate boundary lines and to make the map prettier.

Historically most countries considered 3nm to be the maritime boundary of their nation. Between 1973-1982 the United Nations hosted multiple conventions to determine the future of maritime boundaries. This resulted in the United Nations Conference on the Law of the Sea (UNCLOS III) which came into effect in 1994.

Rules or suggestions

Where limits are not found for a country it should default to 3nm.

In order to give large empires or countries less members we map a separate 0.2nm extra or by default 3.2nm boundary so it doesn't get split so often.

On the boundary line I would usually add these tags: type=boundary, maritime=yes, name=3nm line - Denmark, and to make it even better you can add the end_date and start_date tags to the boundaries if you know exactly when the distance changed.

Example of 3nm, 3.2nm 4nm and 12nm boundary for Denmark.

How to map

On JOSM it is very easy to move multiple relations from one boundary to another by using the OpenData plugin. Select a boundary line and click on Ctrl + C (Copy) and then select the line you want the relations to be moved to and select More Tools > Paste Relations

With Shift + P you can select a boundary line and create a parallel duplicate line by dragging from the line to the new location. Look at the bottom panel to see how far you've dragged it. Click on the distance unit to change it to NM if it isn't already.

Read More

https://forum.openhistoricalmap.org/t/how-should-we-handle-territorial-waters-or-should-we-include-shorelines-in-boundaries/154/3

Territorial Maritime Claims of Countries

81 of 182 completed (45%) as of January 9, 2026

133 of 182 completed (72%) as of August 15, 2026

182 of 182 completed (100%) as of August 17, 2026

Africa

Country	Completed	From/To Limit	Start Date	Source
43 of 43 completed (100%)
Algeria	Yes	3nm-12nm	1963-10-12	Decree No. 63-403 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Angola	Yes	3nm-12nm	1992-08-28	Law 21/92 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Benin	Yes	3nm-12nm	1968-03	Decree No. 74 https://stjececmsdusgva001.blob.core.usgovcloudapi.net/public/documents/Benin2020.pdf
	Yes	12nm-200nm	1976-04-02	Decree No. 76-92 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	200nm-12nm	1998-12	Benin claims 12nm boundary but doesn't list it with the UN https://stjececmsdusgva001.blob.core.usgovcloudapi.net/public/documents/Benin2020.pdf
Cameroon	Yes	3nm-50nm	1974-12-05	Law No. 74/16 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	50nm-12nm	2000-04	Law No. 2000-2 https://stjececmsdusgva001.blob.core.usgovcloudapi.net/public/documents/Cameroon_2024.pdf
Canary Islands	Yes	See Spain
Cape Verde	Yes	3nm-12nm	1977-12-31	Decree Law No. 126/77 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Comoros	Yes	3nm-12nm	1982-05-06	Law No. 82-005 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Congo	Yes	3nm-200nm	1977-12-20	Ordinance No. 049/77 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	200nm-12nm	2018-03	Stjececmsdusgva001.blob.core.usgovcloudapi
DRC	Yes	3nm-12nm	1974-07-10	Law No. 74/009 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Côte d’Ivoire	Yes	3nm-12nm	1977-11-17	Law No. 77-926 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Djibouti	Yes	3nm-12nm	1979-01-09	Law 52/AN/798 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	If France converted all colonies to 12nm in 1971 already, then independent Djibouti never had to change theirs?
Egypt	Yes	3nm-12nm	1958-02-17	Presidential Decree No. 180/1958 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Equatorial Guinea	Yes	3nm-12nm	1984-11-12	Act No. 15/1984 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Eritrea	Yes	See Ethiopia
Ethiopia	Yes	3nm-12nm	1991-09-15	Proclamation No. 7 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Gabon	Yes	3nm-12nm	1984-07-12	Law No. 9/84 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Ghana	Yes	3nm-12nm	1986-08-02	Maritime Zones Law https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Guinea	Yes	3nm-12nm	1980-07-30	Decree No. 336/PRG/80 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Guinea-Bissau	Yes	3nm-12nm	1978-05-19	Law No. 3/78 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Kenya	Yes	3nm-12nm	1972-05-16	Territorial Waters Act No. 2 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Liberia	Yes	3nm-200nm	1977-02-16	Act to Approve Executive Order of Dec. 24, 1976 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	200nm-12nm	2013-01-10	Executive Order No. 39 https://www.un.org/depts/los/LEGISLATIONANDTREATIES/PDFFILES/LBR_10Jan2013_Act_EO48.pdf
Libya	Yes	3nm-12nm	1959-02-18	Territorial Waters Act No. 2 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Madagascar	Yes	3nm-12nm	1985-09-21	Ordinance No. 85-013 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Mauritania	Yes	3nm-12nm	1988-08-31	Ordinance 88-120 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Mauritius	Yes	3nm-12nm	1970-04-16	Territorial Seas Act https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Mayotte	Yes	See France
Morocco	Yes	3nm-12nm	1973-03-02	Law 1-73-211 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Mozambique	Yes	3nm-12nm	1976-08-19	Decree Law No. 31/76 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Namibia	Yes	3nm-12nm	1990-06-30	Act No. 03 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Nigeria	Yes	3nm-30nm	1971-08-26	Territorial Waters Decree No. 38 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	30nm-12nm	1998-01-01	Territorial Waters Decree 19978 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Reunion	Yes	See France
Saint Helena and Dependencies	Yes	3nm-12nm	1990-01-01	St. Helena and Dependencies (Territorial Sea) Order 1989 https://www.legislation.gov.uk/uksi/1989/1994/article/1/made
Sao Tome and Principe	Yes	3nm-12nm	1998-03-23	Act No. 1/98 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Senegal	Yes	3nm-12nm	1985-02-25	Law 85-14 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Seychelles	Yes	3nm-12nm	1977-08-01	Maritime Zones Act No. 15 of 1977 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Sierra Leone	Yes	3nm-200nm	1971-04-19	Interpretations Act, 1971 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	200nm-12nm	1996-06-06	The Maritime Zones Decree 1996 https://www.sierra-leone.org/Laws/1996-NPRC11.pdf
Somalia	Yes	3nm-12nm	1966-11-01	Decree Law No. 7 http://www.somalilandlaw.com/maritime_law.htm
	Yes	12nm-200nm	1972-09-10	Law No. 37 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	200nm-12nm	1989-01-26	Law No. 5 http://www.somalilandlaw.com/maritime_law.htm
South Africa	Yes	3nm-12nm	1994-11-11	Maritime Zones Act, 1994, No. 15 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Sudan	Yes	3nm-12nm	1960-08-02	Council of Minister's Resolution No. 1047 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Tanzania	Yes	3nm-12nm	1989-10-15	Territorial Sea and Exclusive Economic Zone Act, 1989 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Togo	Yes	3nm-30nm	1977-08-16	Ordinance No. 24 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Tunisia	Yes	3nm-12nm	1973-02-02	Law 73-49 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
The Gambia	Yes	3nm-12nm	1969-07-10	Act No. 9 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf

Asia

Country	Completed	From/To Limit	Start Date	Source
42 of 42 completed (100%) 2026-05-22 completed
Azerbaijan	Yes	unknown-15nm	2018-08-12	Convention on the Legal Status of the Caspian Sea http://en.kremlin.ru/supplement/5328
Bahrain	Yes	3nm-12nm	1993-04-20	Decree No. 8 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Bangladesh	Yes	3nm-12nm	1974-04-13	Territorial Waters Act No. 26 and Proclamation No. LT-I/3/74 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
British Indian Ocean Territory	Yes	3nm		Still only claims 3nm https://msi.admiralty.co.uk/nms/annual/12.pdf
Brunei	Yes	3nm-12nm	1958-09-11	Order in Council 1517 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Cambodia	Yes	3nm-12nm	1982-07-31	Council of State Decree https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
China	Yes	3nm-12nm	1958-09-04	Declaration on the Territorial Sea https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
East Timor	Yes	See Indonesia
Georgia	Yes	See USSR
Hong Kong British	Yes	See the United Kingdom
India	Yes	3nm-12nm	1976-08-25	Maritime Zones Act No. 80, 1976 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Indonesia	Yes	3nm-12nm	1960-02-18	Regulation No. 4 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Iran	Yes	3nm-12nm	1959-04-12	https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Iran Caspian	Yes	unknown-15nm	2018-08-12	Convention on the Legal Status of the Caspian Sea http://en.kremlin.ru/supplement/5328
Iraq	Yes	3nm-12nm	1958-11-04	Republican Ordinance No. 435 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Israel	Yes	3nm-12nm	1990-02-05	Law No. 5750 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Japan	Yes	3nm-12nm	1977-07-01	Law No. 30; Cabinet Order No. 209 and 210 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Jordan	Yes	3nm		Still only claims 3nm https://msi.admiralty.co.uk/nms/annual/12.pdf
Kazakhstan	Yes	unknown-15nm	2018-08-12	Convention on the Legal Status of the Caspian Sea http://en.kremlin.ru/supplement/5328
Kuwait	Yes	3nm-12nm	1967-12-17	https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Lebanon	Yes	3nm-12nm	1983-09-17	Decree-Law No. 138 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Malaysia	Yes	3nm-12nm	1969-08-02	Ordinance No. 7 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Myanmar	Yes	3nm-12nm	1977-04-09	Territorial Sea and Maritime Zones Law No. 3 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
North Korea	Yes	3nm-12nm	1955-03-05	Resolution No. 25 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Oman	Yes	3nm-12nm	1972-07-20	https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Pakistan	Yes	3nm-12nm	1966-12-26	https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Philippines	Yes	3nm-12nm	1961-06-17	Republic Act No. 3046 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Qatar	Yes	3nm-12nm	1992-04-16	Decree No. 40 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Russia Asia	Yes	See Europe Table
Russia Caspian	Yes	unknown-15nm	2018-08-12	Convention on the Legal Status of the Caspian Sea http://en.kremlin.ru/supplement/5328
Saudi Arabia	Yes	3nm-12nm	1958-02-16	Royal Decree No. 33 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Singapore	Yes	3nm	1878	https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
South Korea	Yes	3nm-12nm	1977-12-31	Territorial Sea Law No. 3037 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Sri Lanka	Yes	3nm-12nm	1971-01-01	12nm maritime boundary proclamation https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Syria	Yes	3nm-12nm	1963-12-28	Legislative Decree No. 304 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	12nm-35nm	1981-08-16	Law No. 37 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	35nm-12nm	2003-11-19	Law No. 28 https://www.un.org/depts/los/LEGISLATIONANDTREATIES/PDFFILES/syr_2003e.pdf
Taiwan	Yes	3nm-12nm	1998-01-21	Law on the Territorial Sea and the Contiguous Zone of the Republic of China (21 January 1998) https://brill.com/edcollchap/book/9789004532090/BP000013.xml?language=en
Thailand	Yes	3nm-12nm	1966-10-06	Royal Proclamation https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Turkey	Yes	3nm-6nm	1964-05-15	Law No. 476 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	6nm-12nm	1982-05-20	Law No. 2674 and Decree https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Turkmenistan	Yes	unknown-15nm	2018-08-12	Convention on the Legal Status of the Caspian Sea http://en.kremlin.ru/supplement/5328
United Arab Emirates	Yes	3nm-12nm	1970-04-05	https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Vietnam	Yes	3nm-12nm	1977-05-12	https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	12nm+	1982-07-31	Establishes straight baselines https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Yemen	Yes	3nm-12nm	1967-04-30	Presidential Resolution No. 17 (Sanaa) https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf

Europe

Country	Completed	From/To Limit	Start Date	Source
32 of 32 completed (100%) August 15, 2026 completed
Akrotiri and Dhekelia	Yes	3nm		Never enlarged
Albania	Yes	3nm-15nm	1976-02-23	Decree No. 5384 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	15nm-12nm	1990-03-24	Decree No. 7366 of March 9, 1990 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Bosnia & Herzegovina	Yes		1994-01-12	Yugoslavia maritime claims did not extend to the successor states https://www.durham.ac.uk/media/durham-university/research-/research-centres/ibru-centre-for-borders-research/maps-and-databases/publications-database/Maritime-Briefings-(Vol.-1-no.-8).pdf
Croatia	---	3nm-12nm	1995-04-05	Yugoslavia maritime claims did not extend to the successor states https://www.durham.ac.uk/media/durham-university/research-/research-centres/ibru-centre-for-borders-research/maps-and-databases/publications-database/Maritime-Briefings-(Vol.-1-no.-8).pdf
Cyprus	Yes	3nm-12nm	1964-08-06	Law No. 45 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Denmark	Yes	4nm-3nm	1874	https://www.jstor.org/stable/2189474
	Yes	?-3nm	1966-12-21	(Reaffirmed or updated?) Baseline segments in European Datum System: https://www.retsinformation.dk/eli/lta/1966/437
	Yes	3nm-12nm	1999-05-01	May 1999 Act No. 200 on the Delimitation of the Territorial Sea (Does not apply to Greenland and Faroe Islands) https://www.un.org/Depts/los/LEGISLATIONANDTREATIES/PDFFILES/DNK_1999_Act.pdf Coastline and straight line segments defined in WGS84: https://www.retsinformation.dk/eli/lta/1999/242 (danish)
Estonia	Yes	12nm		3nm pre Soviet-era 12nm as Latvia SSR and 3nm between Latvia and Estonia until 1996 post-Soviet. https://iilss.net/maritime-boundaries-between-latvia-and-estonia/
Faroe islands	Yes	See Denmark
Finland	Yes
France	Yes	3nm-12nm
Germany	Yes	12nm	1994-11-11	https://www.un.org/depts/los/LEGISLATIONANDTREATIES/PDFFILES/mzn_s/mzn1.pdf
Gibraltar	Yes	3nm		Still only claims 3nm https://msi.admiralty.co.uk/nms/annual/12.pdf
Greece	Yes	3nm-6nm	1936-09-17	https://opil.ouplaw.com/display/10.1093/law:epil/9780199231690/law-9780199231690-e1240?p=emailA/MsQAG3uZBM.&d=/10.1093/law:epil/9780199231690/law-9780199231690-e1240&print#
Greece	Yes	6nm-partial 12nm	2021-01-20	Law No. 4767 https://greekcitytimes.com/2021/01/21/extension-waters-ionian-sea-ratified/ https://stjececmsdusgva001.blob.core.usgovcloudapi.net/public/documents/Greece2021.pdf
Guernsey	Yes	3nm-12nm		The Territorial Sea Act 1987 https://www.legislation.gov.uk/uksi/2019/1108/article/2/made
Iceland	Yes	4nm-12nm	1979-06-01	4nm inherited from Denmark. https://faolex.fao.org/docs/pdf/ice1316.pdf
Ireland	Yes	3nm-12nm	2006-04-04	In 1959 they signed the 3nm boundary. https://www.irishstatutebook.ie/eli/1959/act/22/section/3/enacted/en/html#sec3 And then 12nm in 2006 https://www.un.org/Depts/los/doalos_publications/LOSBulletins/bulletinpdf/bulletin62e.pdf
Isle of Man	Yes	3nm-12nm	1991-09-02	Territorial Sea Act 1987 (Isle of Man) Order 1991 https://www.legislation.gov.uk/uksi/1991/1722/article/1/made
Italy	Yes
Jersey	Yes	3nm-12nm	1997-03-31	Territorial Sea Act 1987 (Jersey) Order 1997 https://www.legislation.gov.uk/uksi/1997/278/article/1/made
Latvia	Yes	12nm	1996-07-12	3nm pre Soviet-era 12nm as Latvia SSR and 3nm between Latvia and Estonia until 1996 post-Soviet. https://iilss.net/maritime-boundaries-between-latvia-and-estonia/
Lithuania	Yes	12nm	1992-06-25	Inherited from USSR and ratified in 1992 https://faolex.fao.org/docs/pdf/lit22373.pdf
Norway	Yes	4nm-12nm	2004-01-01	https://core.ac.uk/download/pdf/228446825.pdf
Poland	Yes	12nm	1991-03-21	https://www.un.org/depts/los/LEGISLATIONANDTREATIES/PDFFILES/POL_1991_Act.pdf
Portugal	Yes	3nm-12nm	1997-01-15	Ratification of the LOS Convention of 1984 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Russia	Yes	3nm-12nm	1960-02-21	https://docs.rwu.edu/cgi/viewcontent.cgi?article=2465&context=law_ma_jmlc
Slovenia	---	3nm-12nm	1995-06-16	Yugoslavia maritime claims did not extend to the successor states https://www.durham.ac.uk/media/durham-university/research-/research-centres/ibru-centre-for-borders-research/maps-and-databases/publications-database/Maritime-Briefings-(Vol.-1-no.-8).pdf
Spain	Yes
Sweden	Yes	4nm-12nm	1980-01-01	https://repository.law.umich.edu/cgi/viewcontent.cgi?article=1739&context=mjil
The Netherlands	Yes	3nm-12nm
United Kingdom	Yes	3nm-12nm	1987-05-15	Territorial Sea Act 1987 https://www.legislation.gov.uk/ukpga/1987/49/introduction
Yugoslavia	Yes	3nm-12nm	1982-12-10	1982 signed 1986-05-05 ratification https://www.durham.ac.uk/media/durham-university/research-/research-centres/ibru-centre-for-borders-research/maps-and-databases/publications-database/Maritime-Briefings-(Vol.-1-no.-8).pdf

North America

Country	Completed	From/To Limit	Start Date	Source
38 of 38 completed (100%) completed on August 15, 2026
Anguilla	Yes	Median	1996-06-27	Agreement on Maritime Delimitation of 27 June 1996 Boundary established between Anguilla and Saint Martin and Saint Barthelemy https://www.legislation.gov.uk/uksi/2007/2916/made#:~:text=This%20Order%20extends%20the%20boundaries%20of%20the,Martin%20and%20Saint%20Barthelemy%2C%20on%20the%20other.
	Yes	3nm-12nm	2007-10-31	https://www.legislation.gov.uk/uksi/2007/2916/made#:~:text=This%20Order%20extends%20the%20boundaries%20of%20the,Martin%20and%20Saint%20Barthelemy%2C%20on%20the%20other.
Antigua and Barbuda	Yes	3nm-12nm	1982-08-17	Maritime Areas Act, 1982, Act No. 18 of 17 August 1982(1)
Aruba	Yes	See The Netherlands
Barbados	Yes	3nm-12nm	1977-06-23	Territorial Waters Act, 1977-No. 26 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Belize	Yes	3nm-12nm	1992-01-24	Maritime Areas Act 1982 https://www.oas.org/sap/peacefund/belizeandguatemala/timelinedocuments/1992-April3-StatementbyMinisterofForeignAffairsofBelizeSaidMusa.pdf
Bermuda	Yes	3nm-12nm	1988-11-28	Bermuda (Territorial Sea) Order in Council 1988 https://www.legislation.gov.uk/uksi/1988/1838/made
British Virgin Islands	Yes	3nm-12nm	2007-08-15	Virgin Islands (Territorial Sea) Order 2007 https://www.legislation.gov.uk/uksi/2007/2141/article/1/made
Canada	Yes	3nm-12nm	1970-06-26	Amended Territorial Sea and Fishery Zones Act https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	12nm	1974-03-13	Limits in the Seas No 72 Establishes the boundary between Canada and Greenland https://www.state.gov/wp-content/uploads/2019/11/LIS-72.pdf
Cayman Islands	Yes	3nm-12nm	1990-01-01	Cayman Islands (Territorial Sea) Order 1989 https://www.legislation.gov.uk/uksi/1989/2397/article/1/made
Costa Rica	Yes	3nm-12nm	1975-06-05	Decree No. 5699 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Cuba	Yes	3nm-12nm	1978-01-01	https://www.state.gov/wp-content/uploads/2019/12/LIS-110.pdf
Curacao	Yes	See The Netherlands
Dominica	Yes	3nm-12nm	1981-08-25	Territorial Sea, Contiguous Zone, Exclusive Economic and Fishery Zones Act, 1981 Act No. 26 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Dominican Republic	Yes	3nm-6nm	1967-09-13	Law No. 186 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	6nm-12nm	2007-05-22	Act 66-07, 22 May 2007 https://www.un.org/depts/los/LEGISLATIONANDTREATIES/PDFFILES/DOM_2007_Act_frombulletin65.pdf
El Salvador	Yes	3nm-200nm	1950-07-09	Constitution, Article 7 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf El Salvador has never ratified the 12nm UNCLOS treaty, and thus I believe them to still have a valid 200nm claim even though other coutnries don't recognize it.
	Yes	200nm-12nm	2004-12	Civil Code (Article 574) : Rolled back territorial sea from 200nm to 12nm https://stjececmsdusgva001.blob.core.usgovcloudapi.net/public/documents/el_salvador_2014.pdf
Greenland	Yes	3nm		Greenland still only claims a 3nm boundary https://www.sjorettsfondet.no/journal/2020/535/m-1029 https://msi.admiralty.co.uk/nms/annual/12.pdf
	Yes	3nm	1974-03-13	Limits in the Seas No 72 Establishes the boundary between Canada and Greenland https://www.state.gov/wp-content/uploads/2019/11/LIS-72.pdf
Grenada	Yes	3nm-12nm	1978-11-01	Territorial Waters Act No. 17 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Guadeloupe	Yes	See France
Guatemala	Yes	3nm-12nm	1976-07-01	Decree No. 20-76 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	Median	1992-01-24	Belize defines it's Maritime boundaries
Haiti	Yes	3nm-12nm	1977-04-08	Decree No. 38 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Honduras	Yes	3nm-12nm	2007-10-08	ICJ defines the Caribbean maritime boundary https://www.icj-cij.org/case/120
Jamaica	Yes	3nm-12nm	1971-07-19	Act No. 14 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Martinique	Yes	See France
Montserrat	Yes	3nm		Still only claims 3nm https://msi.admiralty.co.uk/nms/annual/12.pdf
Nicaragua	Yes	3nm-200nm	1979-12-19	Act No. 205 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	200nm-12nm	2000-05-03	Ratification of UNCLOS https://www.icj-cij.org/node/104741
Puerto Rico	Yes	See the United States
Saint Lucia	Yes	3nm-12nm	1984-07-18	Maritime Areas Act No. 6 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Saint Kitts and Nevis	Yes	3nm-12nm	1984-08-30	Maritime Act No. 3 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Saint Barthelemy	Yes	See France
Saint Martin	Yes	See France
Saint Vincent and the Grenadines	Yes	3nm-12nm	1983-06-08	Act No. 15 of 1983 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Sint Maarten	Yes	See the Netherlands
St. Pierre and Miquelon	Yes	3nm-12nm	1972-03-27	Boundary agreement with Canada (St. Pierre & Miquelon) EIF; see LIS No. 57 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
The Bahamas	Yes	3nm-12nm	1996-01-04	Archipelagic Waters and Maritime Jurisdiction Act, 1993 (No. 37 of 1993) https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Trinidad and Tobago	Yes	3nm-12nm	1969-12-06	Territorial Sea Act No. 38 Territorial Sea (Amendment) https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Turks and Caicos	Yes	3nm-12nm	1990-01-01	Turks and Caicos Islands (Territorial Sea) Order 1989 https://www.legislation.gov.uk/uksi/1989/1996/article/1/made
United States	Yes		1972-04-18	Boundary agreement with Mexico to 12 nm EIF; see LIS No. 45. https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	3nm-12nm	1988-12-27	Presidential Proclamation No. 5928 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
United States Virgin Islands	Yes	See the United States

Oceania

Country	Completed	From/To Limit	Start Date	Source
21 of 21 completed (100%) completed August 16, 2026
American Samoa	Yes	See the United States
Australia	Yes	3nm-12nm	1983-02-14	Proclamation of Feb. 4, 1983 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Cocos Islands	Yes	See Australia
Cook Islands	Yes	3nm-12nm	1977-11-14	Territorial Sea and Exclusive Economic Zone Act No. 16 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Fiji	Yes	3nm-12nm	1977-12-15	Marine Spaces Act, 1977 (No. 18) https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
French Polynesia	Yes	See France
Guam	Yes	See the United States
Kiribati	Yes	3nm-12nm	1983-05-16	Maritime Zones Act No. 7, 1983 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Marshall Islands	Yes	3nm-12nm	1984-09-13	Marine Zones (Declaration) Act 1984 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Micronesia	Yes	3nm-12nm	1988-12-16	Public Law No. 5-112 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Nauru	Yes	3nm-12nm	1972-02-11	Interpretation Act No. 12, 1971 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
New Zealand	Yes	3nm-12nm	1977-09-26	Territorial Sea and Exclusive Economic Zone Act 1977; Act No. 28 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Niue	Yes	3nm-12nm	1997-04-07	Territorial Sea and Exclusive Economic Zone Act, 1997 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Palau	Yes	3nm	1978-11-30	PL 6-7-14 ¶4, modified https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf **I guess it informally accepted the 12nm boundary on it's independence in 1994?
Papua New Guinea	Yes	3nm-12nm	1978-03-01	National Seas Act, Act No. 7 of 1977 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Pitcairn	Yes	3nm		Still only claims 3nm https://msi.admiralty.co.uk/nms/annual/12.pdf
Samoa	Yes	3nm-12nm	1971-07-15	Territorial Sea Act No. 3 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Solomon Islands	Yes	3nm-12nm	1978-12-21	Delimitation of Marine Waters Act, Act No. 32 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Tokelau	Yes	3nm-12nm	1980-04-01	Tokelau (Territorial Sea and Exclusive Economic Zone) Act 1977 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Tuvalu	Yes	3nm-12nm	1984-01-01	Marine Zones (Declaration) Ordinance https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Vanuatu	Yes	3nm-12nm	1982-10-06	Maritime Zones Act No. 23 of 1981 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf

South America

Country	Completed	From/To Limit	Start Date	Source
14 of 14 completed (100%) completed August 17, 2026
Argentina	Yes	3nm-200nm	1967-01-19	Law No. 17,094 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	200nm-12nm	1991-09-13	Act No. 23,968 of August 14, 1991 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Brazil	Yes	3nm-200nm	1970-03-27	Decree Law No. 1098 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	200nm-12nm	1993-01-04	Law No. 8617 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
British Antarctic Territory	Yes	3nm		Antarctic territories still keep 3nm https://msi.admiralty.co.uk/nms/annual/12.pdf
Chile	Yes	3nm-200nm	1952-08-18	Declaration on the maritime zone, 18 August 1952 https://www.un.org/Depts/los/LEGISLATIONANDTREATIES/PDFFILES/TREATIES/CHL-ECU-PER1952MZ.PDF
	Yes	200nm-12nm	1986-10-26	Law No. 18.565 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Colombia	Yes	3nm-12nm	1978-08-04	Law No. 10 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Ecuador	Yes	3nm-200nm	1966-11-10	Decree Law No. 1542 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf See map and other articles here https://www.un.org/Depts/los/LEGISLATIONANDTREATIES/STATEFILES/ECU.htm
	Yes	200nm-12nm	2012-09	Ratification of 1982 UNCLOS https://stjececmsdusgva001.blob.core.usgovcloudapi.net/public/documents/Ecuador2018.pdf
Falkland Islands	Yes	3nm-12nm	1990-01-01	Falkland Islands (Territorial Sea) Order 1989 https://www.legislation.gov.uk/uksi/1989/1993/article/1/made
French Guiana	Yes	See France
Guyana	Yes	3nm-12nm	1977-06-30	Maritime Boundaries Act No. 10 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Peru	Yes	3nm-200nm	1947-08-01	Supreme Decree https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
South Georgia and the South Sandwich Islands	Yes	3nm-12nm	1990-01-01	South Georgia and South Sandwich Islands (Territorial Sea) Order 1989 https://www.legislation.gov.uk/uksi/1989/1995/article/1/made
Suriname	Yes	3nm-12nm	1978-06-11	Act No. 26 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Uruguay	Yes	3nm-200nm	1969-12-03	Decree 604/969 and Ordinance 1983 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	200nm-12nm	1998-11-20	Act No. 17.033 https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
Venezuela	Yes	3nm-12nm	1956-07-27	Territorial Sea Law https://www.state.gov/wp-content/uploads/2020/01/LIS-36.pdf
	Yes	Orinoco Bay straight baseline	1968-07-10	Presidential Decree No. 1,152 https://www.state.gov/wp-content/uploads/2019/10/LIS-21.pdf