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
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 62.649677°N 141°W / 62.649677; -141, north of the Yukon–Alaska Highway border crossing A lake island at 62.641158°N 141°W / 62.641158; -141, north of the Yukon–Alaska Highway border crossing A lake island at 62.637174°N 141°W / 62.637174; -141, just north of the Yukon–Alaska Highway border crossing Two islands in a small lake at 62.538443°N 141°W / 62.538443; -141, 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 49°N 120.177376°W / 49; -120.177376 An island in a small lake on the Okanogan County, Washington/British Columbia border at 49°N 120.172980°W / 49; -120.172980 An island in a small lake adjacent to the Milk River at 49°N 110.546975°W / 49; -110.546975 in Montana/Alberta An island in Salt Lake (Alkali Lake) 49°N 104.311173°W / 49; -104.311173 in Montana/Saskatchewan An island in Brush Lake at 49°N 103.981638°W / 49; -103.981638 in North Dakota/Saskatchewan Two islands in Boundary Lake at 49°N 100.217095°W / 49; -100.217095, in North Dakota/Manitoba An island in Lake Metigoshe at 49°N 100.353901°W / 49; -100.353901 in North Dakota/Manitoba An islet east of Ross Lake at 49°N 100.298939°W / 49; -100.298939 in North Dakota/Manitoba An island in a small lake on the Rolette County, North Dakota/Manitoba border at 49°N 100.013149°W / 49; -100.013149 An island in a small lake on the Towner County, North Dakota/Manitoba border at 49°N 99.218163°W / 49; -99.218163 An island in a small lake on the Cavalier County, North Dakota/Manitoba border at 49°N 98.541357°W / 49; -98.541357 Pine and Curry Island in Lake of the Woods on the Minnesota/Ontario border at 48.876967°N 94.683964°W / 48.876967; -94.683964 Seaway Island in Lake St. Clair on the Michigan/Ontario border at 42.523639°N 82.677582°W / 42.523639; -82.677582 An island in a small lake on the border of Maine/New Brunswick at 46.004988°N 67.7810°W / 46.004988; -67.7810, southeast of Hodgdon, Maine Province Island in Lake Memphremagog, between Quebec (91%) and Vermont (9%) Between Norway and Russia: In Klistervatn: Store Grenenholmen In Grensevatn: Korkeasaari and an unnamed islet Between Finland and Russia: Äikkäänniemi in Nuijamaanjärvi Suursaari and a smaller island in Ylä-Tyrjä Tarraassiinsaari, Härkäsaari, and Kiteensaari in Melaselänjärvi Island in Virmajärvi Rajasaari in Kokkojärvi Kalmasaari in Vuokkijärvi Varposaari in Hietajärvi Parvajärvensaari in Parvajärvi Keuhkosaari in Pukarijärvi / Ozero Pyukharin Siiheojansuusaari and Tossensaari in Onkamojärvi / Ozero Onkamo Between Finland and Norway: Island in Kivisarijärvi/Keđgisualuijävri Island in lake SE of boundary marker 347A Between Sweden and Norway: Island in Sör Vammsjön/Vammen Søndre (≈2000 m2) Hisön/Hisøya in Norra Kornsjön/Nordre Kornsjø (≈0,09 km2) Kulleholmen/Kalholmen (≈5500 m2) and Tagholm/Tåkeholmen (≈600 m2) in Södra Boksjön/Søndre Boksjø Salholmen (≈4000 m2), Mosvikøya (≈0.17 km2) and Trollön/Trolløya (≈0.18 km2) in Stora Le/Store Le Tannsjöröset (≈50 m2) in Tannsjøen/Tannsjön Linneholmene (≈2000 m2) in Helgesjøen/Helgesjön Jensøya in Holmsjøen (≈0,04 km2) Storøya in Utgardsjøen (≈0,04 km2) Fallsjøholmen in Fallsjøen (Nordre Røgden) (≈4000 m2) Island in Kroksjøen Island in Vonsjøen (≈9000 m2) Island in Skurdalssjøen/Kruehkiejaevrie Island in a lake at altitude 710m on the Gihcijoka/Gihtsejåhkå river Three islands in Čoarvejávri Between Belarus and Latvia: Unnamed island in Lake Rychy Between Lithuania and Belarus: Sosnovec and another nameless island in Lake Drūkšiai Between the United Kingdom and Ireland: Pollatawny in Lough Vearty. 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.
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