This is a list of islands whose territory is shared among two or more sovereign countries and delineated by one or more international borders. This list includes territorial disputes where islands are de facto divided or where at least one party's territorial claims include division of an island.
Sea islands
Island Area Population Countries/Dependencies (Provinces/States/Sovereign) Area Populationkm2sq miNew GuineaNew Guinea is the second most extensive sea island and the highest sea island with the summit of Puncak Jaya at .785,753 11,306,94059%68% (Central Papua, Highland Papua, Papua, South Papua, and West Papua)41%32%BorneoBorneo is the third most extensive sea island and the third highest sea island with the summit of Mount Kinabalu at .748,168 21,258,000 (Central, East, North, South, and West Kalimantan)73%70% (Sabah and Sarawak)26%28%1%2%Ireland84,421 6,806,90083%72% (Northern Ireland)17%28%HispaniolaLago Enriquillo on Hispaniola is the lowest point on any sea island at -.76,192 21,396,00064%50%36%50%Isla Grande deTierra del Fuego47,401133,861 (Antártica Chilena, Tierra del Fuego)61%5% ()39%95%Timor28,418 3,182,693 ()51%63% 49%37%Cyprus9,234 1,133,803De jure97%98% Akrotiri and Dhekelia ( United Kingdom)3%2%De facto58%65%36%33% (UN Buffer Zone in Cyprus)3%1% Akrotiri and Dhekelia ( United Kingdom)3%1%Dall IslandThe tip of Cape Muzon was established as the "point of commencement" of the international boundary with Alaska in the Anglo-Russian Convention of 1825. A Court of Arbitration in 1903 ruled that Point "A" () was the initial point of this boundary. Canada has accepted this as a demarcated boundary; however, the U.S. disputes that Point "A" is a boundary point.655.2 20 ()<100%100% ()>0%noneSebatik Island452.2 105,000 ()55%76% ()45%34%Usedom445 85,047 ()84%41% ()16%59%Saint Martin91.9 77,741 Saint-Martin ()59%51% ()41%49%Hans Island1.2 0 ()60%none ( Nunavut) 40%noneKataja(including Inakari)Map of Inakari, the Finnish part of Kataja 0.71 0 (Norrbotten County)~85%none (Lapland)~15%nonePassport IslandPassport Island is an artificial island approximately in the middle of the King Fahd Causeway.0.66 0 (Northern Governorate)~50%none (Eastern Province)~50%noneK IslandNova Zemlia Island or K Island is a barrier island formed in Danube River Delta in 1988.0.56 0 ()~60%none (Tulcea County)~40%noneKoiluotoMap of Koiluoto 0.03 0 (Kymenlaakso)~60%none (Leningrad Oblast)~40%noneMärket0.03 0 ()~55%none (Stockholm County and Uppsala County)~45%noneVanhasaari/)Map of Vanhasaari 0.89 0 (Kymenlaakso)none (Leningrad Oblast)noneJähiMap of Jähi 0.019686 0 (Kymenlaakso)none (Leningrad Oblast)noneIsland southeast of PeräluotoMap of divided island southeast of Peräluoto 0.000212 0 (Kymenlaakso)none (Leningrad Oblast)none
Lake islands Among Finland, Norway, and Sweden: Three-Country Cairn, the boundary cairn at the tripoint, is 10 metres from the shore of Lake Goldajärvi/Koltajauri, and hence arguably a tiny artificial island. Around 14 m2. The lower limit for artificial islands is a matter of definition, because near Haparanda there are boundary poles of less than 0.1 m2. Between Canada and the United States: A lake island at , north of the Yukon–Alaska Highway border crossing A lake island at , north of the Yukon–Alaska Highway border crossing A lake island at , just north of the Yukon–Alaska Highway border crossing Two islands in a small lake at , 8.2 km south of the Yukon–Alaska Highway border crossing Several rocky islets in a small lake on the Okanogan County, Washington/British Columbia border at An island in a small lake on the Okanogan County, Washington/British Columbia border at An island in a small lake adjacent to the Milk River at in Montana/Alberta An island in Salt Lake (Alkali Lake) in Montana/Saskatchewan An islandRetrieved 19 June 2013 Bing MapsRetrieved 19 June 2013 North Dakota Hub Explorer in Brush Lake at in North Dakota/Saskatchewan Two islandsRetrieved 19 June 2013 Bing MapsRetrieved 19 June 2013 North Dakota Hub Explorer in Boundary Lake at , in North Dakota/Manitoba An islandRetrieved 19 June 2013 Bing MapsRetrieved 19 June 2013 North Dakota Hub Explorer in Lake Metigoshe at in North Dakota/Manitoba An isletRetrieved 19 June 2013 Bing MapsRetrieved 19 June 2013 North Dakota Hub Explorer east of Ross Lake at in North Dakota/Manitoba An islandRetrieved 19 June 2013 Bing MapsRetrieved 19 June 2013 North Dakota Hub Explorer in a small lake on the Rolette County, North Dakota/Manitoba border at An islandRetrieved 19 June 2013 Bing MapsRetrieved 19 June 2013 North Dakota Hub Explorer in a small lake on the Towner County, North Dakota/Manitoba border at An islandRetrieved 19 June 2013 Bing MapsRetrieved 19 June 2013 North Dakota Hub Explorer in a small lake on the Cavalier County, North Dakota/Manitoba border at Pine and Curry Island in Lake of the Woods on the Minnesota/Ontario border at Seaway Island in Lake St. Clair on the Michigan/Ontario border at An island in a small lake on the border of Maine/New Brunswick at , southeast of Hodgdon, Maine, at the edge of the Lt. Gordon Manuel Wildlife Management Area. Province Island in Lake Memphremagog, between Quebec (91%) and Vermont (9%) Between Norway and Russia: In Klistervatn: Store Grenenholmen — boundary markers #169–172 In Grensevatn: Korkeasaari and an unnamed islet — boundary markers #12–13 (Korkeasaari) & #14 (unnamed islet) Between Finland and Russia: Äikkäänniemi in NuijamaanjärviPortion of Nuijamaanjärvi with Äikkäänniemi marked from Citizen's Mapsite of Finland. Suursaari and a smaller island in Ylä-TyrjäPortion of Yla-Tirja with divided islands at markers 93 (Suursaari) and 94 (smaller island) from Citizen's Mapsite of Finland. Tarraassiinsaari, Härkäsaari, and Kiteensaari in MelaselänjärviPortion of Melaselänjärvi showing Tarraassiinsaari and Härkäsaari from Citizen's Mapsite of Finland.Portion of Melaselänjärvi showing Kiteensaari from Citizen's Mapsite of Finland. Island in Virmajärvi in KokkojärviPortion of Kokkojärvi showing Rajasaari from Citizen's Mapsite of Finland. Kalmasaari in VuokkijärviPortion of Vuokkijärvi showing Kalmasaari from Citizen's Mapsite of Finland. Varposaari in HietajärviPortion of Hietajärvi showing Varposaari from Citizen's Mapsite of Finland. Parvajärvensaari in ParvajärviPortion of Parvajärvi showing Parvajärvensaari from Citizen's Mapsite of Finland. Keuhkosaari in Pukarijärvi / Ozero PyukharinPortion of Pukarijärvi with Keuhkosaari marked from Citizen's Mapsite of Finland. Siiheojansuusaari and Tossensaari in Onkamojärvi / Ozero OnkamoInternational 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."Portion of Onkamojärvi from Citizen's Mapsite of Finland (Siiheojansuusaari is IV/179; Tossonsaari is IV/180) Between Finland and Norway: Island in Kivisarijärvi/KeđgisualuijävriPortion of Kivisarijärvi with divided island marked from Citizen's Mapsite of Finland. Island in lake SE of boundary marker 347ANeighborhood of boundary marker 347A, with divided island marked from Citizen's Mapsite of Finland. Between Sweden and Norway:Verified at Norwegian state cartographic agency website Island in Sör Vammsjön/Vammen Søndre (≈2000 m2) Hisön/Hisøya in Norra Kornsjön/Nordre Kornsjø (≈0,09 km2)Hisøya: Kulleholmen/Kalholmen (≈5500 m2) and Tagholm/Tåkeholmen (≈600 m2) in Södra Boksjön/Søndre BoksjøSøndre Boksjø: Salholmen (≈4000 m2), Mosvikøya (≈0.17 km2) and Trollön/Trolløya (≈0.18 km2) in Stora Le/Store LeSalholmen: ; Mosvikøya ; Trollön : Tannsjöröset (≈50 m2) in Tannsjøen/TannsjönTannsjøen Island ("Nr 54" on Norwegian map): Linneholmene (≈2000 m2) in Helgesjøen/HelgesjönLinneholmene: Jensøya in Holmsjøen (≈0,04 km2)Jensøya: Storøya in Utgardsjøen (≈0,04 km2)Storøya: Fallsjøholmen in Fallsjøen (Nordre Røgden) (≈4000 m2)Fallsjøholmen: Island in KroksjøenKroksjøen's island: Island in Vonsjøen (≈9000 m2)Vonsjøen's island: Island in Skurdalssjøen/KruehkiejaevrieSkurdalssjøen's island: Island in a lake at altitude 710m on the Gihcijoka/Gihtsejåhkå riverGihcijoka island: Three islands in ČoarvejávriČoarvejávri's islands: largest:; middle:; southern: Between Belarus and Latvia: Unnamed island in Lake Rychy Between Lithuania and Belarus: Sosnovec and another nameless island in Lake Drūkšiai The international border is marked on the map. Sosnovec is named on this map.Coordinates of Lake Drūkšiai: Between the United Kingdom and Ireland: Pollatawny in Lough Vearty.Verified against Ordnance Survey of Ireland 6-inch map of the townland of Tober, County Donegal; surveyed 1905-05-05. Coordinates: Irish national grid reference system: G996663 Between Argentina and Chile: Isla Dos Hitos in Lago General Carrera/Lago Buenos Aires Between Ethiopia and Djibouti: Island off Cape Aleilou in Lake Abbe The border between Austria and Hungary cuts across the Neusiedler See/Fertő tó, where the water level fluctuates, sometimes exposing island flats which straddle the border.
River islands Island () in the Moselle River near Schengen: mostly in France, the tip is in the Moselle condominium shared by Luxembourg and Germany. Coordinates: Bolshoy Ussuriyskiy (Heixiazi) at the confluence of the Ussuri and Amur rivers, between China and Russia.Дополнительное соглашение между Российской Федерацией и Китайской Народной Республикой о российско-китайской государственной границе на ее Восточной части от 14 октября 2004 года. Bolshoy (Abagaitu) at the Argun River, between China and Russia. An island in the Šešupė River divided between Lithuania and the Kaliningrad Oblast of Russia Corocoro Island in the delta of the Barima River: split between Venezuela and GuyanaThe 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. San Jose Island, Río Negro: between Colombia and Brazil. Co-ordinates: The island complex Martín García–Timoteo Domínguez in the Río de la Plata between Argentina and Uruguay. Turunchuk (Turunciuc) Island formed by Dniester River and its anabranch Turunchuk on Ukraine-Moldovan border. The lower reaches of the Ganges,See map of Nawabganj District, map of Rajshahi District, and map of Daulatpur upazila of Kushtia District, all in Bangladesh. Teesta,See map of Dilma upazila in Nilphamari District, Bangladesh. and BrahmaputraSee map of Kurigram district, Bangladesh. Rivers, approaching the Ganges Delta, are braided and contain numerous sand islands called chars. These can be large and inhabited but are impermanent. At any given time, several are likely to straddle the border between India (Assam and West Bengal) and Bangladesh, though this border is not fully specified. An island labelled 'Q' in the Maritsa River, between Greece and Turkey. An islet in the Uutuanjoki, between Finland and Norway, at . An islet in the Vadet near Tunnsjø, between Norway and Sweden, at . An islet on the western side of the golf course that straddles the municipalities of Tornio in Finland, and Haparanda in Sweden, at . An islet in the Euphrates River on the border of Iraq and Syria. Nokiel and another unnamed islet in the Dunajec river, between Slovakia and Poland, at . Nicaragua and Honduras share four islands along a straight-line border in the delta of the Río Negro at the Gulf of Fonseca. Argentina and Chile share an island formed by branches of the Río Mayer. Bolivia and Chile share an island formed by the and its branch, Quebrado Coipacoipani. Canada/United States: 9 islands serially located in the Clarence River on the Alaska North Slope near Demarcation Bay; northernmost at , southernmost at One or more islands in Trail Creek at , northeast of Arctic Village, Alaska An island in Mancha Creek at , northeast of Arctic Village, Alaska