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.
Canada has a vast geography that occupies much of the continent of North America, sharing a land border with the contiguous United States to the south and the U.S. state of Alaska to the northwest. Canada stretches from the Atlantic Ocean in the east to the Pacific Ocean in the west; to the north lies the Arctic Ocean. Greenland is to the northeast with a shared border on Hans Island. To the southeast Canada shares a maritime boundary with France's overseas collectivity of Saint Pierre and Miquelon, the last vestige of New France. By total area, Canada is the second-largest country in the world, after Russia. By land area alone, however, Canada ranks fourth, the difference being due to it having the world's largest proportion of fresh water lakes. Of Canada's thirteen provinces and territories, only two are landlocked while the other eleven all directly border one of three oceans.
The Arctic Archipelago, also known as the Canadian Arctic Archipelago, is an archipelago lying to the north of the Canadian continental mainland, excluding Greenland and Iceland.
Williams County is located on the western border of the U.S. state of North Dakota, next to Montana. As of the 2020 census, the population was 40,950. making it the fifth most populous county in North Dakota. Its county seat is Williston.
Bear Creek is a census-designated place (CDP) in Kenai Peninsula Borough, Alaska, United States. At the 2020 census the population was 2,129 up from 1,956 in 2010. Bear Creek is a few miles north of Seward near the stream of the same name and its source, Bear Lake.
The Continental Divide of the Americas is the principal, and largely mountainous, hydrological divide of the Americas. The Continental Divide extends from the Bering Strait to the Strait of Magellan, and separates the watersheds that drain into the Pacific Ocean from those river systems that drain into the Atlantic and Arctic Ocean, including those that drain into the Gulf of Mexico, the Caribbean Sea, and Hudson Bay.
The Adams–Onís Treaty of 1819, also known as the Transcontinental Treaty, the Spanish Cession, the Florida Purchase Treaty, or the Florida Treaty, was a treaty between the United States and Spain in 1819 that ceded Florida to the U.S. and defined the boundary between the U.S. and Mexico. It settled a standing border dispute between the two countries and was considered a triumph of American diplomacy. It came during the successful Spanish American wars of independence against Spain.
The 49th parallel north is a circle of latitude that is 49° north of Earth's equator. It crosses Europe, Asia, the Pacific Ocean, North America, and the Atlantic Ocean.
In the United States, time is divided into nine standard time zones covering the states, territories and other US possessions, with most of the country observing daylight saving time (DST) for approximately the spring, summer, and fall months. The time zone boundaries and DST observance are regulated by the Department of Transportation, but no single map of those existed until the agency announced intentions to make one in September 2022. Official and highly precise timekeeping services (clocks) are provided by two federal agencies: the National Institute of Standards and Technology (NIST) ; and the United States Naval Observatory (USNO). The clocks run by these services are kept synchronized with each other as well as with those of other international timekeeping organizations.
The Canada–United States border is the longest international border in the world. The boundary is 8,891 km (5,525 mi) long. The land border has two sections: Canada's border with the contiguous United States to its south, and with the U.S. state of Alaska to its west. The bi-national International Boundary Commission deals with matters relating to marking and maintaining the boundary, and the International Joint Commission deals with issues concerning boundary waters. The agencies responsible for facilitating legal passage through the international boundary are the Canada Border Services Agency (CBSA) and U.S. Customs and Border Protection (CBP).
This is a list of the extreme points of Europe: the geographical points that are higher or farther north, south, east or west than any other location in Europe. Some of these positions are open to debate, as the definition of Europe is diverse.
This is a list of the extreme points of North America: the points that are highest and lowest, and farther north, south, east or west than any other location on the continent. Some of these points are debatable, given the varying definitions of North America.
The northernmost point of land within the boundaries of Canada is Cape Columbia, Ellesmere Island, Nunavut 83.111°N 69.972°W. The northernmost point of the Canadian mainland is Zenith Point on Boothia Peninsula, Nunavut 72.002°N 94.655°W. The southernmost point is Middle Island, in Lake Erie, Ontario ; the southernmost water point lies just south of the island, on the Ontario–Ohio border (41°40′35″N). The southernmost point of the Canadian mainland is Point Pelee, Ontario 41.909°N 82.509°W. The lowest point is sea level at 0 m, whilst the highest point is Mount Logan, Yukon, at 5,959 m / 19,550 ft 60.567°N 140.405°W.
This is a list of the extreme points of The Americas, the points that are farther north, south, east or west than any other location on the continent. The continent's southernmost point is often said to be Cape Horn, which is the southernmost point of the Chilean islands. The Americas cross 134° of longitude east to west and 124° of latitude north to south.
A quadripoint is a point on Earth where four distinct political territories meet. The territories can be of different types, such as national and provincial. In North America, several such places are commonly known as Four Corners. Several examples exist throughout the world that use other names.
The history of post-confederation Canada began on July 1, 1867, when the British North American colonies of Canada, New Brunswick, and Nova Scotia were united to form a single Dominion within the British Empire. Upon Confederation, the United Province of Canada was immediately split into the provinces of Ontario and Quebec. The colonies of Prince Edward Island and British Columbia joined shortly after, and Canada acquired the vast expanse of the continent controlled by the Hudson's Bay Company, which was eventually divided into new territories and provinces. Canada evolved into a fully sovereign state by 1982.
Border irregularities of the United States, particularly panhandles and highway incursions into other jurisdictions, are shown here. Often they are a result of borders which do not conform to geological features such as changes in the course of a river that previously marked a border.
A continental divide is a drainage divide on a continent such that the drainage basin on one side of the divide feeds into one ocean or sea, and the basin on the other side either feeds into a different ocean or sea, or else is endorheic, not connected to the open sea. Every continent on earth except Antarctica has at least one continental drainage divide; islands, even small ones like Killiniq Island on the Labrador Sea in Canada, may also host part of a continental divide or have their own island-spanning divide. The endpoints of a continental divide may be coastlines of gulfs, seas or oceans, the boundary of an endorheic basin, or another continental divide. One case, the Great Basin Divide, is a closed loop around an endorheic basin. The endpoints where a continental divide meets the coast are not always definite since the exact border between adjacent bodies of water is usually not clearly defined. The International Hydrographic Organization's publication Limits of Oceans and Seas defines exact boundaries of oceans, but it is not universally recognized. Where a continental divide meets an endorheic basin, such as the Great Divide Basin of Wyoming, the continental divide splits and encircles the basin. Where two divides intersect, they form a triple divide, or a tripoint, a junction where three watersheds meet.
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".
