Maritime boundaries are vital for both maintaining peaceful borders with our neighbors and clearly delimiting our rights and interests with respect to fishing and marine living resources, mineral and hydrocarbon resources, freedom of navigation, maritime domain awareness and security, and other uses of the sea.

Below are the maritime boundary treaties and related international agreements of the United States on record at the U.S. Department of State. Additional treaty documents may be accessed on our archive: https://2009-2017.state.gov/e/oes/ocns/opa/c28187.htm.

Canada

  • Passamaquoddy Bay (1910) 36 Stat. 2477; Treaty Series 551
  • Delimitation of the Maritime Boundary in the Gulf of Maine, ICJ Judgment (1984)

Cook Islands

  • Treaty between the United States of America and the Cook Islands (1980)

Cuba

  • Maritime Boundary Agreement between the United States of America and the Republic of Cuba (1977), Senate Treaty Document 96-8
  • Treaty between the United States of America and the Republic of Cuba on the Delimitation of the Continental Shelf in the Eastern Gulf of Mexico beyond 200 Nautical Miles (2017; not yet entered into force)

Kiribati

  • Treaty between the Government of the United States of America and the Government of the Republic of Kiribati on the Delimitation of Maritime Boundaries (2013; not yet entered into force), Senate Treaty Document 114-13

Federated States of Micronesia

  • Treaty between the Government of the United States of America and the Government of the Federated States of Micronesia on the Delimitation of a Maritime Boundary (2014; not yet entered into force), Senate Treaty Document 114-13

Mexico

New Zealand

  • Treaty between the United States of America and New Zealand on the Delimitation of the Maritime Boundary Between Tokelau and the United States of America (1980), Senate Treaty Document 97-5

Niue

  • Treaty between the Government of the United States of America and the Government of Niue on the Delimitation of a Maritime Boundary (1997), Senate Treaty Document 105-53

Russian Federation

  • The Agreement between the United States of America and the Union of Soviet Socialist Republics on the Maritime Boundary (1990), Senate Treaty Document 101-22

United Kingdom

  • Treaty on the delimitation in the Caribbean of a maritime boundary relating to the U.S. Virgin Islands and Anguilla (1993), Senate Treaty Document 103-23
  • Treaty on the delimitation in the Caribbean of a maritime boundary relating to Puerto Rico/U.S. Virgin Islands and the British Virgin Islands (1993), Senate Treaty Document 103-23

Venezuela

Chronological List (most recent first):

18 JAN 2017: U.S. – Cuba (Eastern Gulf of Mexico)

18 JAN 2017: U.S. – Mexico (Eastern Gulf of Mexico)

01 AUG 2014: U.S. (Guam) – Federated States of Micronesia

06 SEP 2013: U.S. (Howland, Baker and Jarvis Islands, Kingman Reef, Palmyra Atoll) – Republic of Kiribati

09 JUN 2000: U.S. – Mexico (Western Gulf of Mexico)

13 MAY 1997: U.S. (American Samoa) – Niue

05 NOV 1993: U.S. (USVI) – UK (British Virgin Islands)

05 NOV 1993: U.S. (USVI) – UK (Anguilla)

29 SEP 1990: U.S. – Russian Federation / USSR

02 DEC 1980: U.S. (American Samoa) – New Zealand (Tokelau)

11 JUN 1980: U.S. (American Samoa) – Cook Islands

29 MAR 1979: U.S. – Canada (Gulf of Maine, ICJ Judgment)

04 MAY 1978: U.S. (Puerto Rico and USVI) – Venezuela

04 MAY 1978: U.S. – Mexico (Gulf of Mexico and Pacific Ocean)

16 DEC 1977: U.S. – Cuba

23 NOV 1970: U.S. – Mexico (Rio Grande and Colorado River)

01 MAY 1910: U.S. – UK / Canada

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