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
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 (58%)
 Turkish Republic of Northern Cyprus (37%)
 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].
Sebatik Island 452.2[1]  Indonesia, North Kalimantan
 Malaysia, Sabah
Usedom 445[7]  Germany (79%)[7] 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 (Middle Island), King Fahd Causeway 0.66[9]  Saudi Arabia
Märket 0.03  Finland (50%) Åland Islands
 Sweden (50%) Uppsala County and Stockholm County
Koiluoto <0.03  Finland (>50%)
 Russia (<50%)[10]
Nova Zemlia (Нова Земля)  Ukraine (>50%)
 Romania (<50%)[11] aerial view
Rotten Sea islands De facto
 Russia (Crimea) (>50%)
 Ukraine (<50%)[12][13][14]

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 1645–69 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:

  • Vozrozhdeniya Island in the Aral Sea was split between the Soviet Republics of Uzbekistan and Kazakhstan. This border became an international one in 1991 when the U.S.S.R. was dissolved. By the year 2002, this island had become a peninsula of the mainland because of the falling water level of the Aral Sea.
  • The small Bogomerom archipelago of islets in Lake Chad was formerly divided between Chad and Nigeria.[84] The water level of Lake Chad has historically varied a lot, but this level has fallen so low that these islets are now part of the mainland of Africa.
  • The small middle island of Las Tres Hermanas ("The Three Sisters") off the Pacific coast of Panama City was split between the U.S. Panama Canal Zone and Panama by the Taft Agreement on December 12, 1904. The entire island was placed in the Canal Zone on February 11, 1915. Today the Cinta Costera lies on top of it.

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. Assateague Island, a barrier island on the Atlantic coast of the United States, is divided between the states of Maryland and Virginia, and Fenwick Island, 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 Dao, in the People's Republic of China, is divided between Guangdong Province and the Special Administrative Region and former Portuguese overseas province of Macau.

The island of Ceylon (Sri Lanka) has also two nationalities – Sinhalese and Tamils. Tamils live in the North and Eastern Provinces, whereas Sinhala people live in other provinces. Tamils call their place Eelam. The island is naturally divided when mapped by language, religion and ethnicity race.

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. Alaska Packers Association. p. 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. Glasgow, Brook & Company. p. 936-958. 
  7. ^ a b Margedant, Udo; Thomas Ellerbeck (1991). Politische Landeskunde Mecklenburg-Vorpommern (in German). Mecklenburg-Vorpommern: Landeszentrale für politische Bildung. p. 89. 
  8. ^ 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
  9. ^ "Border Station". King Fahd Causeway. King Fahd Causeway Authority. Retrieved 2009-09-27. 
  10. ^ 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
  11. ^ Map of Black Sea Western Coast 45°10′19″N 29°45′57″E / 45.171932°N 29.765944°E / 45.171932; 29.765944
  12. ^ Google Map 45°57′56″N 34°32′01″E / 45.96558°N 34.53372°E / 45.96558; 34.53372
  13. ^ Google Map 45°58′09″N 34°32′15″E / 45.96910°N 34.53740°E / 45.96910; 34.53740
  14. ^ Google Map 45°45′40″N 34°57′53″E / 45.761179°N 34.964817°E / 45.761179; 34.964817
  15. ^ Retrieved 19 June 2013 Bing Maps
  16. ^ Retrieved 19 June 2013 North Dakota Hub Explorer
  17. ^ Retrieved 19 June 2013 Bing Maps
  18. ^ Retrieved 19 June 2013 North Dakota Hub Explorer
  19. ^ Retrieved 19 June 2013 Bing Maps
  20. ^ Retrieved 19 June 2013 North Dakota Hub Explorer
  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 North Dakota Hub Explorer
  30. ^ 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. 
  31. ^ "Norway-Russia Boundary Map: Boundary markers 167–177: Sandneset-Klistervatn" (in Norwegian/Russian). Norwegian Boundary Commission for the Norway-Russia border. Retrieved 2007-09-25.  — boundary markers #169–172
  32. ^ "Norway-Russia Boundary Map: Boundary markers 7–14: Grenseberg-Ødevasselva" (in Norwegian/Russian). Norwegian Boundary Commission for the Norway-Russia border. Retrieved 2007-09-25.  — boundary markers #12–13 (Korkeasaari) & #14 (unnamed islet)
  33. ^ Portion of Nuijamaanjärvi with Äikkäänniemi marked from Citizen's Mapsite of Finland.
  34. ^ Portion of Yla-Tirja with divided islands at markers 93 (Suursaari) and 94 (smaller island) from Citizen's Mapsite of Finland.
  35. ^ Portion of Melaselänjärvi showing Tarraassiinsaari and Härkäsaari from Citizen's Mapsite of Finland.
  36. ^ Portion of Melaselänjärvi showing Kiteensaari from Citizen's Mapsite of Finland.
  37. ^ Portion of Kokkojärvi showing Rajasaari from Citizen's Mapsite of Finland.
  38. ^ Portion of Vuokkijärvi showing Kalmasaari from Citizen's Mapsite of Finland.
  39. ^ Portion of Hietajärvi showing Varposaari from Citizen's Mapsite of Finland.
  40. ^ Portion of Parvajärvi showing Parvajärvensaari from Citizen's Mapsite of Finland.
  41. ^ 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. 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. 
  42. ^ Portion of Pukarijärvi with Keuhkosaari marked from Citizen's Mapsite of Finland.
  43. ^ 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."
  44. ^ Portion of Onkamojärvi from Citizen's Mapsite of Finland (Siiheojansuusaari is IV/179; Tossonsaari is IV/180)
  45. ^ 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
  46. ^ 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
  47. ^ Verified at Norwegian state cartographic agency website (English) (Norwegian) (Sami)
  48. ^ 58°53′18″N 11°27′27″E / 58.88843°N 11.45739°E / 58.88843; 11.45739
  49. ^ Hisøya: 58°54′22.8″N 11°39′7.1″E / 58.906333°N 11.651972°E / 58.906333; 11.651972
  50. ^ Søndre Boksjø: 59°02′N 11°42′E / 59.03°N 11.7°E / 59.03; 11.7
  51. ^ Salholmen: 59°14′15.96″N 11°49′32.24″E / 59.2377667°N 11.8256222°E / 59.2377667; 11.8256222; Trollön: 59°15′17.76406″N 11°49′13.45279″E / 59.2549344611°N 11.8204035528°E / 59.2549344611; 11.8204035528
  52. ^ 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
  53. ^ Linneholmene: 59°53′20.98″N 12°1′59.96″E / 59.8891611°N 12.0333222°E / 59.8891611; 12.0333222
  54. ^ Jensøya: 59°53′35.77″N 12°6′47.88″E / 59.8932694°N 12.1133000°E / 59.8932694; 12.1133000
  55. ^ Storøya: 60°0′55.9″N 12°23′42.5″E / 60.015528°N 12.395139°E / 60.015528; 12.395139
  56. ^ Fallsjøholmen: 60°33′2.9″N 12°34′54.76″E / 60.550806°N 12.5818778°E / 60.550806; 12.5818778
  57. ^ Kroksjøen's island: 60°44′02″N 12°23′43″E / 60.733895°N 12.395381°E / 60.733895; 12.395381
  58. ^ Vonsjøen's island: 62°15′38″N 12°17′46″E / 62.260625°N 12.296161°E / 62.260625; 12.296161
  59. ^ Skurdalssjøen's island: 63°21′28″N 12°05′10″E / 63.357646°N 12.085973°E / 63.357646; 12.085973
  60. ^ Gihcijoka island: 67°39′55″N 16°34′11″E / 67.665396°N 16.569616°E / 67.665396; 16.569616
  61. ^ 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
  62. ^ Krogh, Jan S. "Lake Druksiai". Retrieved 2006-12-10.  The international border is marked on the map.
  63. ^ "World Lakes Database: LAKE DRUKSIAI". International lakes environment committee. 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. 
  64. ^ "Bathymetric map of Lake Drūkšiai" (GIF). International lakes environment committee. Retrieved 2006-12-10. [dead link] Sosnovec is named on this map.
  65. ^ Coordinates of Lake Drūkšiai:55°37′N 26°38′E / 55.617°N 26.633°E / 55.617; 26.633
  66. ^ 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
  67. ^ 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. 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. 
  68. ^ "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
  69. ^ a b Дополнительное соглашение между Российской Федерацией и Китайской Народной Республикой о российско-китайской государственной границе на ее Восточной части от 14 октября 2004 года.
  70. ^ 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
  71. ^ 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. 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
  72. ^ 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
  73. ^ See map of Nawabganj District, map of Rajshahi District, and map of Daulatpur upazila of Kushtia District, all in Bangladesh.
  74. ^ See map of Dilma upazila in Nilphamari District, Bangladesh.
  75. ^ See map of Kurigram district, Bangladesh.
  76. ^ Asiatic Society of Bangladesh. "Banglapedia: "Char"". Retrieved 2006-11-06. 
  77. ^ 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. 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". 
  78. ^ "Zmluva medzi Poľskou republikou a Slovenskou republikou o zmenách priebehu štátnej hranice a schválení hraničnej dokumentácie". Dziennik Ustaw (in Slovak) (Prime Minister of Poland) (203): 1686. 29 July 2002. Retrieved 28 May 2013.  Check date values in: |year= / |date= mismatch (help)
  79. ^ "Bing Maps". Retrieved 19 June 2013. 
  80. ^ "NDGIS North Dakota Hub Explorer". Retrieved 19 June 2013. 
  81. ^ Ramerini, Marco. "Dutch and Courlanders in Tobago: A history of the first settlements, 1628–1677". Retrieved 2007-10-01. 
  82. ^ 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. 
  83. ^ 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. 
  84. ^ Office of the Geographer (June 1969). "Chad-Nigeria boundary" (JPEG). United States Department of State. Retrieved 2006-12-06. 
  85. ^ "April 11, 2012 audio report on Hans Island". Canadian Broadcasting Corporation. Retrieved 2012-04-24. 

External links[edit]