List of divided islands

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This is a list of islands whose land is divided by one or more international borders.

Sea islands[edit]

Island Area in km2 Countries (percentage of island's area)
New Guinea 785,753[1]  Indonesia (53.52%) Papua, West Papua
 Papua New Guinea (46.48%)
Borneo 748,168[1]  Indonesia (73%) Central Kalimantan, East Kalimantan, North Kalimantan, South Kalimantan, West Kalimantan
 Malaysia (26%) Sabah, Sarawak
 Brunei (1%)
Ireland 81,638[1]  Ireland (83%)
 United Kingdom (17%) Administered as Northern Ireland.
Hispaniola 76,192[2][3]  Dominican Republic (64%)
 Haiti (36%)
(Isla Grande de) Tierra del Fuego 47,992[1]  Chile (56%) Tierra del Fuego
 Argentina (44%) Tierra del Fuego
Timor 28,418[1]  Indonesia (53%) East Nusa Tenggara
 East Timor (47%)
Cyprus 9,234[1] De jure
 Republic of Cyprus (97%)
 United Kingdom (3%) Akrotiri and Dhekelia, Sovereign Base Areas
De facto
 Republic of Cyprus (57%)
 Turkish Republic of Northern Cyprus (38%)
 United Kingdom (3%) Akrotiri and Dhekelia, Sovereign Base Areas
 United Nations buffer zone (2%)
Dall Island 655.2[1]  United States (<100%)
 Canada (>0%) The tip of Cape Muzon was established as the "point of commencement" of the international boundary with Alaska in the Anglo-Russian Convention of 1825.[4] A Court of Arbitration in 1903 ruled that Point "A" ( 54°39′43.993″N 132°41′3.093″W / 54.66222028°N 132.68419250°W / 54.66222028; -132.68419250 )[5] was the initial point of this boundary.[6] Canada has accepted this as a demarcated boundary; however, the U.S. disputes that Point "A" is a boundary point.[7]
Sebatik Island 452.2[1]  Indonesia, North Kalimantan
 Malaysia, Sabah
Usedom (Uznam) 445[8]  Germany (79%)[8] Vorpommern-Greifswald
 Poland (21%) West Pomeranian Voivodeship
Saint Martin 91.9[1]  France (61%) Saint-Martin, an overseas collectivity
 Kingdom of the Netherlands (39%) Sint Maarten, a constituent country
Kataja (including Inakari) 0.71  Finland
Passport Island, an artificial island approximately in the middle of the King Fahd Causeway 0.66[10]  Saudi Arabia
Märket 0.03  Finland (50%) Åland Islands
 Sweden (50%) Uppsala County and Stockholm County
Koiluoto 0.03  Finland (>50%)
 Russia (<50%)[11]
K Island, or Nova Zemlia (Нова Земля), a barrier island formed at the mouth of the Danube River in 1988[12][13][14] 0.56  Ukraine (>50%)
 Romania (<50%)[15][16]
Musura Bay, Black Sea.jpg

Isla Portillos (es) 151.6  Costa Rica
 Nicaragua On 2 Feb 2018, the ICJ rendered a decision in a border dispute between Nicaragua and Costa Rica regarding Isla Portillos (es), an island formed by the Río San Juan, Rio Taura and Caribbean Sea. Nicaragua was left with just the Laguna Los Portillos and its short strip of beach. The ICJ concluded that the whole beach is Costa Rican except for the part directly between the lagoon and the Caribbean Sea - now a tiny enclave of Nicaraguan territory separated from the rest of the country.[17]

Lake islands[edit]

River islands[edit]

Historically divided islands[edit]

Other islands have been divided by international borders in the past but they are now unified.

The definite borders of modern nation-states do not apply in other forms of societal organisation, where "divided" islands may consequently be less noteworthy. For example, in Ancient Greece, the island of Euboea was divided among several city states, including Chalcis and Eretria; and before its settlement by Europeans, the Island of Tasmania was divided among nine indigenous tribes.

Islands in wartime may be divided between an invading and defending power, as with Crete in 1645–1669 between the Ottoman Empire and the Republic of Venice.

Examples of formerly divided islands include:

A few former islands have disappeared because of changes in water levels:

Subnational divided islands[edit]

There are islands that lie across different provinces or states of the same country. An example would be Killiniq Island of Canada, which is divided between Newfoundland and Labrador and Nunavut, whereas Melville Island and Victoria Island are divided between Nunavut and the Northwest Territories. In Australia, the Boundary Islet is divided between Tasmania and Victoria. Smith Island in Chesapeake Bay and Assateague Island, a barrier island on the Atlantic coast of the United States, are divided between the states of Maryland and Virginia. Fenwick Island, on the coast immediately to the north, is divided between Maryland and Delaware. Ellis Island, itself in the United States state of New Jersey, contains a true exclave of the state of New York; elsewhere in New York Harbor, the northern tip of Shooters Island, otherwise in New York, is in New Jersey. Zhongshan Island, in China, is divided between the province of Guangdong and the special administrative region of Macau.

See also[edit]


  1. ^ a b c d e f g h i "Islands by land area". UN system-wide Earthwatch. United Nations Environment Programme. 1998-02-18. Retrieved 2009-09-27. 
  2. ^ Central America and Caribbean: Haiti, CIA World Factbook
  3. ^ Central America and Caribbean: Dominican Republic, CIA World Factbook
  4. ^ Davidson, George (1903). The Alaska Boundary. San Francisco: Alaska Packers Association. pp. 79–81, 129–134, 177–179, 229. 
  5. ^ "International Boundary Commission definition of the Canada/US boundary in the NAD83 CSRS reference frame". Retrieved 2015-03-21. 
  6. ^ White, James (1914). Boundary Disputes and Treaties. Toronto: Glasgow, Brook & Company. pp. 936–958. 
  7. ^ Gray, David H. (Autumn 1997). "Canada's Unresolved Maritime Boundaries" (PDF). IBRU Boundary and Security Bulletin. p. 61. Retrieved 2015-03-21. 
  8. ^ a b Margedant, Udo; Thomas Ellerbeck (1991). Politische Landeskunde Mecklenburg-Vorpommern (in German). Mecklenburg-Vorpommern: Landeszentrale für politische Bildung. p. 89. 
  9. ^ Map of Inakari, the Finnish part of Kataja 65°41′59″N 24°10′08″E / 65.699644°N 24.168781°E / 65.699644; 24.168781
  10. ^ "Border Station". King Fahd Causeway. King Fahd Causeway Authority. Retrieved 2017-12-26. 
  11. ^ Map of Koiluoto, the Finnish part of Koiluoto 60°30′21″N 27°46′21″E / 60.50575°N 27.772472°E / 60.50575; 27.772472
  12. ^ GIOSAN, LIVIU; DONNELLY, JEFFREY P.; VESPREMEANU, EMIL; BHATTACHARYA, JANOK P.; OLARIU, CORNEL; BUONAIUTO, FRANK S. (2005). "RIVER DELTA MORPHODYNAMICS: EXAMPLES FROM THE DANUBE DELTA" (PDF). River Deltas—Concepts, Models, and Examples (Special Publication No. 83). Society for Sedimentary Geology: 403–405. ISBN 1-56576-113-8. 
  13. ^ Randazzo, Giovanni; Jackson, Derek; Cooper, Andrew, eds. (2015). Sand and Gravel Spits (Volume 12 of Coastal Research Library). Springer. p. 332. ISBN 9783319137162. 
  14. ^ Науково-дослідна установа «Український науково-дослідний інститут екологічних проблем». "Анотований зведений заключний звіт про науково-дослідну роботу" (PDF). UNECE. Retrieved 26 May 2017. 
  15. ^ "Wikimapia: Остров Новая Земля". Retrieved 2016-03-01. 
  16. ^ Google map 45°10′19″N 29°45′57″E / 45.171932°N 29.765944°E / 45.171932; 29.765944
  17. ^ "Costa Rica & Nicaragua Settle Border Dispute in Court". Political Geography Now. 3 Feb 2018. Retrieved 2018-02-04. 
  18. ^ Google Map 45°57′56″N 34°32′01″E / 45.96558°N 34.53372°E / 45.96558; 34.53372
  19. ^ Google Map 45°58′09″N 34°32′15″E / 45.96910°N 34.53740°E / 45.96910; 34.53740
  20. ^ Google Map 45°45′40″N 34°57′53″E / 45.761179°N 34.964817°E / 45.761179; 34.964817
  21. ^ Retrieved 19 June 2013 Bing Maps
  22. ^ Retrieved 19 June 2013 North Dakota Hub Explorer
  23. ^ Retrieved 19 June 2013 Bing Maps
  24. ^ Retrieved 19 June 2013 North Dakota Hub Explorer
  25. ^ Retrieved 19 June 2013 Bing Maps
  26. ^ Retrieved 19 June 2013 North Dakota Hub Explorer
  27. ^ Retrieved 19 June 2013 Bing Maps
  28. ^ Retrieved 19 June 2013 North Dakota Hub Explorer
  29. ^ Retrieved 19 June 2013 Bing Maps
  30. ^ Retrieved 19 June 2013 North Dakota Hub Explorer
  31. ^ Retrieved 19 June 2013 Bing Maps
  32. ^ Retrieved 19 June 2013 North Dakota Hub Explorer
  33. ^ Retrieved 19 June 2013 Bing Maps
  34. ^ Retrieved 19 June 2013 North Dakota Hub Explorer
  35. ^ Retrieved 19 June 2013 North Dakota Hub Explorer
  36. ^ Jacques Boisvert. "Province Island". Retrieved 2006-11-04. It is the largest island in Lake Memphremagog, being 77 acres, of which 7 acres, are in the United States. 
  37. ^ "Norway-Russia Boundary Map: Boundary markers 167–177: Sandneset-Klistervatn" (in Norwegian and Russian). Norwegian Boundary Commission for the Norway-Russia border. Archived from the original on 2007-08-14. Retrieved 2007-09-25.  — boundary markers #169–172
  38. ^ "Norway-Russia Boundary Map: Boundary markers 7–14: Grenseberg-Ødevasselva" (in Norwegian and Russian). Norwegian Boundary Commission for the Norway-Russia border. Archived from the original on 2007-08-14. Retrieved 2007-09-25.  — boundary markers #12–13 (Korkeasaari) & #14 (unnamed islet)
  39. ^ Portion of Nuijamaanjärvi with Äikkäänniemi marked from Citizen's Mapsite of Finland.
  40. ^ Portion of Yla-Tirja with divided islands at markers 93 (Suursaari) and 94 (smaller island) from Citizen's Mapsite of Finland.
  41. ^ Portion of Melaselänjärvi showing Tarraassiinsaari and Härkäsaari from Citizen's Mapsite of Finland.
  42. ^ Portion of Melaselänjärvi showing Kiteensaari from Citizen's Mapsite of Finland.
  43. ^ Portion of Kokkojärvi showing Rajasaari from Citizen's Mapsite of Finland.
  44. ^ Portion of Vuokkijärvi showing Kalmasaari from Citizen's Mapsite of Finland.
  45. ^ Portion of Hietajärvi showing Varposaari from Citizen's Mapsite of Finland.
  46. ^ Portion of Parvajärvi showing Parvajärvensaari from Citizen's Mapsite of Finland.
  47. ^ Office of the Geographer, Bureau of Intelligence and Research (1967-02-01). International Boundary Study No. 74: Finland–U.S.S.R. boundary (PDF). United States Department of State. p. 21. Archived from the original (PDF) on 2006-09-16. Hence the frontier a point on a small unnamed island in Lake Pukarinjarvi between the cape west of the village of Laitela and the Niittysaaryi island. 
  48. ^ Portion of Pukarijärvi with Keuhkosaari marked from Citizen's Mapsite of Finland.
  49. ^ International Boundary Study No. 74, page 22. ""The frontier follows the creek down to Lake Onkamojarvi, intersects the small island of Siiheojansuusaai and proceeds in a straight line to the small island of Tossensaari."
  50. ^ Portion of Onkamojärvi from Citizen's Mapsite of Finland (Siiheojansuusaari is IV/179; Tossonsaari is IV/180)
  51. ^ Portion of Kivisarijärvi with divided island marked from Citizen's Mapsite of Finland. 69°44′09″N 28°52′56″E / 69.735926°N 28.88235°E / 69.735926; 28.88235
  52. ^ Neighborhood of boundary marker 347A, with divided island marked from Citizen's Mapsite of Finland. 69°53′N 28°18′E / 69.89°N 28.3°E / 69.89; 28.3
  53. ^ Verified at Norwegian state cartographic agency website Archived 2006-11-25 at the Wayback Machine. (in English) (in Norwegian) (in Northern Sami)
  54. ^ 58°53′18″N 11°27′27″E / 58.88843°N 11.45739°E / 58.88843; 11.45739
  55. ^ Hisøya: 58°54′22.8″N 11°39′7.1″E / 58.906333°N 11.651972°E / 58.906333; 11.651972
  56. ^ Søndre Boksjø: 59°02′N 11°42′E / 59.03°N 11.7°E / 59.03; 11.7
  57. ^ Salholmen: 59°14′15.96″N 11°49′32.24″E / 59.2377667°N 11.8256222°E / 59.2377667; 11.8256222; Mosvikøya 59°15′55″N 11°49′32″E / 59.26528°N 11.82556°E / 59.26528; 11.82556; Trollön : 59°15′17.76406″N 11°49′13.45279″E / 59.2549344611°N 11.8204035528°E / 59.2549344611; 11.8204035528
  58. ^ Tannsjøen Island ("Nr 54" on Norwegian map): 59°52′21.67″N 11°54′59.31″E / 59.8726861°N 11.9164750°E / 59.8726861; 11.9164750
  59. ^ Linneholmene: 59°53′20.98″N 12°1′59.96″E / 59.8891611°N 12.0333222°E / 59.8891611; 12.0333222
  60. ^ Jensøya: 59°53′35.77″N 12°6′47.88″E / 59.8932694°N 12.1133000°E / 59.8932694; 12.1133000
  61. ^ Storøya: 60°0′55.9″N 12°23′42.5″E / 60.015528°N 12.395139°E / 60.015528; 12.395139
  62. ^ Fallsjøholmen: 60°33′2.9″N 12°34′54.76″E / 60.550806°N 12.5818778°E / 60.550806; 12.5818778
  63. ^ Kroksjøen's island: 60°44′02″N 12°23′43″E / 60.733895°N 12.395381°E / 60.733895; 12.395381
  64. ^ Vonsjøen's island: 62°15′38″N 12°17′46″E / 62.260625°N 12.296161°E / 62.260625; 12.296161
  65. ^ Skurdalssjøen's island: 63°21′28″N 12°05′10″E / 63.357646°N 12.085973°E / 63.357646; 12.085973
  66. ^ Gihcijoka island: 67°39′55″N 16°34′11″E / 67.665396°N 16.569616°E / 67.665396; 16.569616
  67. ^ Čoarvejávri's islands: largest:68°01′46″N 17°57′48″E / 68.029364°N 17.963228°E / 68.029364; 17.963228; middle:68°01′35″N 17°57′43″E / 68.0262611°N 17.9620527°E / 68.0262611; 17.9620527; southern:68°01′29″N 17°57′37″E / 68.0247914°N 17.9604023°E / 68.0247914; 17.9604023
  68. ^ Krogh, Jan S. "Lake Druksiai". Retrieved 2006-12-10.  The international border is marked on the map.
  69. ^ "World Lakes Database: LAKE DRUKSIAI". International lakes environment committee. Archived from the original on 2007-03-12. Retrieved 2006-12-10. Number of main islands (name and area): Zamok (0.26 km²), Sosnovec (0.048 km²), Utovec (0.0088 km²) and 5 nameless islands. 
  70. ^ "Bathymetric map of Lake Drūkšiai". International lakes environment committee. Archived from the original (GIF) on 8 January 2006. Retrieved 2006-12-10.  Sosnovec is named on this map.
  71. ^ Coordinates of Lake Drūkšiai:55°37′N 26°38′E / 55.617°N 26.633°E / 55.617; 26.633
  72. ^ Verified against Ordnance Survey of Ireland 6-inch map of the townland of Tober, County Donegal; surveyed 1905-05-05. Coordinates: 54°32′39″N 8°00′30″W / 54.5441°N 8.0084°W / 54.5441; -8.0084 Irish national grid reference system: G996663
  73. ^ Office of the Geographer, Bureau of Intelligence and Research (1976-02-20). International Boundary Study No. No. 154 – Djibouti – Ethiopia Boundary (PDF). United States Department of State. p. 8. Archived from the original (PDF) on 2013-11-09. From Monument No. 53 on the south bank of Lake Abbe, the border crosses the lake from south to north continuing in a straight line for 30 kilometers. It cuts across the islet of hill 255 off Cape Aleilou. 
  74. ^ "Map of Commune of Schengen" (PDF). Commune of Schengen. Retrieved 2006-12-10. . Coordinates: 49°28′08″N 6°22′05″E / 49.46894°N 6.36812°E / 49.46894; 6.36812
  75. ^ a b Дополнительное соглашение между Российской Федерацией и Китайской Народной Республикой о российско-китайской государственной границе на ее Восточной части Archived 2011-08-12 at the Wayback Machine. от 14 октября 2004 года.
  76. ^ The northern shore of Corocoro is on the open ocean, but it is not truly a sea island as the southern boundary is a freshwater channel. The island is claimed in its entirety by Venezuela. 8°31′01″N 60°04′59″W / 8.517°N 60.083°W / 8.517; -60.083
  77. ^ Office of the Geographer, Bureau of Intelligence and Research (1985-04-15). International Boundary Study No. 174: Brazil – Colombia boundary (PDF). United States Department of State. p. 8. Archived from the original (PDF) on 2006-09-16. The final report allocated all river islands on the basis of the thalweg with the exception of San Jose Island on the Rio Negro which was split between Brazil (southern half) and Colombia.  Co-ordinates:1°13′42″N 66°51′17″W / 1.228401°N 66.854811°W / 1.228401; -66.854811
  78. ^ Barros, Vicente (Coordinator) Impact Of Global Change On The Coastal Areas Of The Rio De La Plata: Sea Level Rise And Meteorological Effects. Page 7[permanent dead link]
  79. ^ See map of Nawabganj District, map of Rajshahi District, and map of Daulatpur upazila of Kushtia District, all in Bangladesh.
  80. ^ See map of Dilma upazila in Nilphamari District, Bangladesh.
  81. ^ See map of Kurigram district, Bangladesh.
  82. ^ Chowdhury, Sifatul Quader; Chowdhury, Masud Hasan (2012). "Char". In Islam, Sirajul; Jamal, Ahmed A. Banglapedia: National Encyclopedia of Bangladesh (Second ed.). Asiatic Society of Bangladesh. 
  83. ^ Office of the Geographer, Bureau of Intelligence and Research (1964-11-23). International Boundary Study No. 41: Greece – Turkey boundary (PDF). United States Department of State. p. 7. Archived from the original (PDF) on 2009-03-16. Returning to the median of the Maritsa, [...] the boundary continues [...] to boundary marker No. 24 on the northern end of an island designated "Q". Thence, the boundary line extends a distance of 800.5 feet to marker No. 25 near the center, thence a distance of 1,804 feet to marker No. 26 on the southwestern extremity of island "Q". 
  84. ^ "Zmluva medzi Poľskou republikou a Slovenskou republikou o zmenách priebehu štátnej hranice a schválení hraničnej dokumentácie (AGREEMENT between the Polish Republic and the Slovak Republic on changes of the boundary line and the approval of border documentation, drawn up in the Old Ľubovňa on 29 July 2002.)". Dziennik Ustaw (in Slovak). Prime Minister of Poland (203): 1686. 2005. Retrieved 28 May 2013. 
  85. ^ "NDGIS North Dakota Hub Explorer". Retrieved 19 June 2013. 
  86. ^ Ramerini, Marco. "Dutch and Courlanders in Tobago: A history of the first settlements, 1628–1677". Archived from the original on 2007-09-28. Retrieved 2007-10-01. 
  87. ^ Ireland, Gordon (1941). Boundaries, possessions, and conflicts in Central and North America and the Caribbean. New York: Octagon Books. p. 344. 
  88. ^ Wolff, Sir Henry Drummond (1855). The island empire, or, Scenes of the first exile of the Emperor Napoleon I: together with a narrative of his residence on the island of Elba, taken from local information, the papers of the British resident, and other authentic sources. Bosworth. pp. 304–322. Retrieved 27 August 2011. 
  89. ^ Frey, Linda; Frey, Marsha (1995). The treaties of the War of the Spanish Succession: an historical and critical dictionary. Greenwood Publishing Group. pp. 421–2. ISBN 978-0-313-27884-6. Retrieved 27 August 2011. 
  90. ^ United States. Central Intelligence Agency. (1987). "Land and waters of the Panama Canal Treaty (map)". Washington, D.C. Retrieved 2015-07-15. 
  91. ^ "Carte IV. Aires de terre et d'eau mises à disposition du fonctionnement et de la défense du canal de Panama par le traité relatif au canal de Panama du 7 septembre 1977". Dirección ejecutiva para los asuntos del tratado (DEPAT). Ciudad de Panama. 1981. Retrieved 2015-07-11. 
  92. ^ "A treaty between Great Britain and the United States providing for the more complete definition and demarcation of the international boundary between the Dominion of Canada and the United States". 1908. Retrieved 2016-02-07. 
  93. ^ "Eastport Quadrant 15x15 grid map". United States Geological Survey. 1907. Retrieved 2016-02-07.  (download)
  94. ^ Office of the Geographer (June 1969). "Chad-Nigeria boundary". United States Department of State. Archived from the original (JPEG) on 2007-06-15. Retrieved 2006-12-06. 
  95. ^ "11 April 2012 audio report on Hans Island". Canadian Broadcasting Corporation. Retrieved 2012-04-24. 

External links[edit]