This is a list of islands whose land is divided by one or more international borders.
Contents
- Sea islands
- Lake islands
- River islands
- Historically divided islands
- Subnationally divided islands
- See also
- References
- External links
This is a list of islands whose land is divided by one or more international borders.
[ Several of the density figures, such as those marked (*), don't agree with the other statistics. ]
| Island | Area (km2/sq mi) | Population | Countries/Dependencies (Provinces/States/Sovereign) | Area | Population | Population per km2/per sq mi |
|---|---|---|---|---|---|---|
| New Guinea [1] | 785,753/303,381 [2] | 11,306,940 |  Papua New Guinea | 59% | 68% | 17/44 |
 Indonesia ( Central Papua , Highland Papua , Papua , South Papua , and West Papua ) | 41% | 32% | 11/28 | |||
| Borneo [3] | 748,168/288,869 [2] | 21,258,000 | Indonesia ( Central , East , North , South , and West Kalimantan ) | 73% | 70% | 27/70 |
 Malaysia ( Sabah and Sarawak ) | 26% | 28% | 31/80 | |||
 Brunei | 1% | 2% | 78/200 | |||
| Ireland | 84,421/32,595 [4] | 6,806,900 |  Ireland | 83% | 72% | 70/180 |
 United Kingdom ( Northern Ireland ) | 17% | 28% | (*)275/710 | |||
| Hispaniola [5] | 76,192/29,418 [6] [7] | 21,396,000 |  Dominican Republic | 64% | 50% | 221/570 |
 Haiti | 36% | 50% | 391/1,010 | |||
| Isla Grande de Tierra del Fuego | 47,992/18,530 [2] | 133,861 |  Chile ( Antártica Chilena, Tierra del Fuego ) | 61% | 5% | (*)0.6/1.6 |
 Argentina ( Tierra del Fuego ) | 39% | 95% | 6.9/18 | |||
| Timor | 28,418/10,972 [2] | 3,182,693 | Indonesia ( East Nusa Tenggara ) | 51% | 63% | 128/330 |
 East Timor | 49% | 37% | 78/200 | |||
| Cyprus | 9,234/3,565 [2] | 1,133,803 | De jure | |||
 Cyprus | 97% | 98% | 86/220 | |||
| Akrotiri and Dhekelia ( United Kingdom) | 3% | 2% | 62/160 | |||
| De facto | ||||||
| Cyprus | 58% | 56% | 81/210 | |||
 Northern Cyprus | 35% | 41% | 100/260 | |||
 United Nations ( UN Buffer Zone in Cyprus ) | 4% | 1% | (*)88/230 | |||
| Akrotiri and Dhekelia ( United Kingdom) | 3% | 2% | 62/160 | |||
| Dall Island [8] [9] [10] [11] [12] | 655.2/253.0 [2] | ~20 |  United States ( Alaska ) | <100% | 100% | ~0.03/0.078 |
 Canada ( British Columbia ) | >0% | none | none | |||
| Sebatik Island | 452.2/174.6 [2] | 105,000 | Indonesia ( North Kalimantan ) | 55% | 76% | 320/830 |
Malaysia ( Sabah ) | 45% | 34% | 120/310 | |||
| Usedom [13] | 445/172 | 85,047 |  Germany ( Mecklenburg-Vorpommern ) | 84% | 41% | 84/220 |
 Poland ( West Pomeranian Voivodeship ) | 16% | 59% | 625/1,620 | |||
| Saint Martin | 91.9/35.5 [2] | 77,741 |  Saint-Martin ( France) | 59% | 51% | 682/1,770 |
 Sint Maarten ( Kingdom of the Netherlands) | 41% | 49% | 1,110/2,900 | |||
| Hans Island | 1.2/0.46 | 0 |  Greenland ( Kingdom of Denmark) | 60% | none | none |
Canada ( Nunavut ) | 40% | none | none | |||
| Kataja (including Inakari [14] ) | 0.71/0.27 | 0 |  Sweden ( Norrbotten County ) | ~85% | none | none |
 Finland ( Lapland ) | ~15% | none | none | |||
| Passport Island [15] | 0.66/0.25 | ~10 |  Bahrain ( Northern Governorate ) | ~50% | ~50% | ~8/21 |
 Saudi Arabia ( Eastern Province ) | ~50% | ~50% | ~8/21 | |||
| K Island [16] [17] | 0.56/0.22 | 0 |  Ukraine ( Odesa Oblast ) | ~60% | none | none |
 Romania ( Tulcea County ) | ~40% | none | none | |||
| Koiluoto [18] | 0.03/0.012 | 0 | Finland ( Kymenlaakso ) | ~60% | none | none |
 Russia ( Leningrad Oblast ) | ~40% | none | none | |||
| Vanhasaari/Maly Pogranichny ) [19] [20] | Finland ( Kymenlaakso ) | |||||
| Russia ( Leningrad Oblast ) | ||||||
| Jähi [21] | 0 | Finland ( Kymenlaakso ) | none | none | ||
| Russia ( Leningrad Oblast ) | none | none | ||||
| Island southeast of Peräluoto [22] | 0 | Finland ( Kymenlaakso ) | none | none | ||
| Russia ( Leningrad Oblast ) | none | none | ||||
| Märket | 0.03/0.012 | 0 |  Åland ( Finland) | ~55% | none | none |
| Sweden ( Stockholm County and Uppsala County ) | ~45% | none | none | |||
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:
There are islands that lie across different provinces or states of the same country.
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. Ellis Island contains a true exclave of the state of New York, which is largely the area of the original natural island, while all land reclamation extensions from 1890-1935 are in New Jersey. The states also share Shooters Island in Newark Bay. Owing only to accretion of silt, an island has arisen spontaneously in the Mississippi River at the location of the boundary trijunction of Arkansas, Louisiana, and Mississippi, and is thus divided among the three states.
Pag, in Croatia, is divided between Zadar County and Lika-Senj County.
Ishima, in Japan, is divided between Kagawa Prefecture in the South and Okayama Prefecture in the north. Chek Lap Kok in Hong Kong is divided between Islands and Tuen Mun districts, and Lantau is divided between Islands and Tsuen Wan districts.
Chongming Island, while most commonly known as main part of Chongming District of Shanghai, is having a long and narrow part on the northwest of the island which administrated by Nantong, Jiangsu.
It is the largest island in Lake Memphremagog, being 77 acres, of which 7 acres, are in the United States.
Hence the frontier runs...to a point on a small unnamed island in Lake Pukarinjarvi between the cape west of the village of Laitela and the Niittysaaryi island.
Number of main islands (name and area): Zamok (0.26 km2), Sosnovec (0.048 km2), Utovec (0.0088 km2) and 5 nameless islands.
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.
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″N66°51′17″W / 1.228401°N 66.854811°W
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".
