Boundaries between the continents of Earth(Redirected from Boundaries between continents)
The boundaries between the continents of Earth are generally a matter of geographical convention. Several slightly different conventions are in use. The number of continents is most commonly considered seven but may range as low as four when the Americas and Afro-Eurasia are each considered a single continent. According to the definition of a continent in the strict sense, an island cannot be part of any continent, but by convention and in practice most major islands are associated with a continent.
There are three overland boundaries subject to definition:
- between Europe and Asia (dividing Eurasia): along the Turkish Straits, the Caucasus and the Urals (historically also north of the Caucasus, along the Kuma–Manych Depression or along the Don River)
- between Asia and Africa (dividing Afro-Eurasia into Africa and Eurasia): at the Isthmus of Suez
- between North America and South America (dividing the Americas): the Isthmus of Panama
While the isthmus between Asia and Africa and that between North and South America are today navigable, via the Suez and Panama canals, respectively, diversions and canals of human origin generally are not accepted on their own accord as continent-defining boundaries; the Suez Canal happens to traverse the isthmus between the Mediterranean Sea and Red Sea, dividing Asia and Africa. The remaining boundaries concern the association of islands and archipelagos with specific continents, notably:
- the delineation of Southeast Asia from Australasia
- the delineation between Africa, Europe and Asia in the Mediterranean Sea
- the delineation between Asia and Europe in the Arctic Ocean
- the delineation between Europe and North America in the Atlantic Ocean
- the delineation between North and South America in the Caribbean Sea
- the delineation of Asia from North America in the North Pacific Ocean
Europe and AfricaEdit
The European and African mainlands are non-contiguous, and the delineation between these continents is thus merely a question of which islands are to be associated with which continent. At its nearest point, Morocco and the European portion of Spain are separated by only 13 kilometres (8.1 miles).
The Portuguese Atlantic island possession of the Azores is 1,368 km (850 mi) from Europe and 1,507 km (936 mi) from Africa, and is usually grouped with Europe if grouped with any continent. By contrast, the Canary and Madeira islands off the Atlantic coast of Morocco are much closer to, and usually grouped with, Africa (the Canary Islands are only 100 km (62 mi) from the African coast at their closest point, while Madeira is 520 km (320 mi) from Africa and 1,000 km (620 mi) from Europe).
The Mediterranean island nation of Malta is approximately 81 km (50 mi) from the coast of Sicily in Europe - much closer than the 288 km (179 mi) distance to the closest African coast. The nearby Italian island of Lampedusa is 207 km (129 mi) from Sicily while just 127 km (79 mi) from the African coast; similarly, Pantelleria is 100 km (62 mi) from Sicily and just 71 km (44 mi) from the African coast. All of these Mediterranean islands are actually located on the African plate, and may be considered part of the continent of Africa. However, for political and historical reasons, maps generally display them as part of Europe.
Europe and AsiaEdit
The boundary between Europe and Asia is unusual among continental boundaries because of its largely mountain-and-river-based characteristics north and east of the Black Sea. The reason is historical, the division of Europe and Asia going back to the early Greek geographers. In the modern sense of the term "continent", Eurasia is more readily identifiable as a "continent", and Europe has occasionally been described as a subcontinent of Eurasia.
Anaximander placed the boundary between Asia and Europe along the Phasis River (the modern Rioni) in the Caucasus (from its mouth by Poti on the Black Sea coast, through the Surami Pass and along the Kura River to the Caspian Sea), a convention still followed by Herodotus in the 5th century BC. As geographic knowledge of the Greeks increased during the Hellenistic period, this archaic convention was revised, and the boundary between Europe and Asia was now considered to be the Tanais (the modern Don River). This is the convention used by Roman era authors such as Posidonius, Strabo and Ptolemy.
Throughout the Middle Ages and into the 18th century, the traditional division of the landmass of Eurasia into two continents, Europe and Asia, followed Ptolemy, with the boundary following the Turkish Straits, the Black Sea, the Kerch Strait, the Sea of Azov and the Don (known in antiquity as the Tanais). But maps produced during the 16th to 18th centuries tended to differ in how to continue the boundary beyond the Don bend at Kalach-na-Donu (where it is closest to the Volga, now joined with it by the Volga–Don Canal), into territory not described in any detail by the ancient geographers.
Philip Johan von Strahlenberg in 1725 was the first to depart from the classical Don boundary by drawing the line along the Volga, following the Volga north until the Samara Bend, along Obshchy Syrt (the drainage divide between Volga and Ural) and then north along Ural Mountains. The mapmakers continued to differ on the boundary between the lower Don and Samara well into the 19th century. The 1745 atlas published by the Russian Academy of Sciences has the boundary follow the Don beyond Kalach as far as Serafimovich before cutting north towards Arkhangelsk, while other 18th- to 19th-century mapmakers such as John Cary followed Strahlenberg's prescription. To the south, the Kuma–Manych Depression was identified circa 1773 by a German naturalist, Peter Simon Pallas, as a valley that, once upon a time, connected the Black Sea and the Caspian Sea, and subsequently was proposed as a natural boundary between continents.
By the mid-19th century, there were three main conventions, one following the Don, the Volga–Don Canal and the Volga, the other following the Kuma–Manych Depression to the Caspian and then the Ural River, and the third abandoning the Don altogether, following the Greater Caucasus watershed to the Caspian. The question was still treated as a "controversy" in geographical literature of the 1860s, with Douglas Freshfield advocating the Caucasus crest boundary as the "best possible", citing support from various "modern geographers".
In Russia and the Soviet Union, the boundary along the Kuma–Manych Depression was the most commonly used as early as 1906. In 1958, the Soviet Geographical Society formally recommended that the boundary between the Europe and Asia be drawn in textbooks from Baydaratskaya Bay, on the Kara Sea, along the eastern foot of Ural Mountains, then following the Ural River until the Mugodzhar Hills, and then the Emba River; and Kuma–Manych Depression, thus placing the Caucasus entirely in Asia and the Urals entirely in Europe. However, most geographers in the Soviet Union favoured the boundary along the Caucasus crest and this became the standard convention in the latter 20th century, although the Kuma–Manych boundary remained in use in some 20th-century maps.
|Map of the world according to Anaximander (6th century BC). Only the parts of Europe, Asia and Africa directly adjacent to the Mediterranean and the Black Sea are known. The Phasis River of the Caucasus is imagined as separating Europe from Asia, while the Nile separates Asia from Africa (Libya).|
|In this 1570 map of Asia (Asiae Nova Descriptio), the Tanais is used as continental boundary. Moscovia is represented as "transcontinental", having an Asiatic and a European part (labelled Europae pars).|
|This 1719 map of "ancient Asia" (Asia Vetus) divides Sarmatia into Sarmatia Europea and Sarmatia Asiatica. The continental boundary is drawn along the Tanais (Don), the Volga and the Northern Dvina.|
|Herman Moll (c. 1715) draws the boundary along the Don, the Volga, cutting across land from Samara to the Tobol River, following the lower Irtysh and finally the Ob River, placing Novaya Zemlya in Europe.|
|A German map of 1730 by Johann Christoph Homann has a similar boundary to the one shown by Moll, but following the full length of the Samara bend and then cutting across to the Irtysh directly, placing the Tobol and Tobolsk in Asia.|
|The "Academy Atlas" of the Russian Empire, published by The Saint Petersburg Academy of Sciences in 1745, draws the boundary along the Don, but then west of the Volga to Arkhangelsk|
|1803 Cedid Atlas (Ottoman Empire), draws the boundary along the Don, Volga and River Kama and then cuts northwards to Khaypudyr Bay. Novaya Zemlya is in Europe.|
|1806 map of Asia by John Cary, boundary along the Don and then the Volga until Samara, and north of Perm following the Urals, placing Novaya Zemlya in Asia.|
|1827 map by Anthony Finley, showing the boundary as running along the Don, the Volga, passing between Perm and Ufa, and running north over land to the Sea of Kara, placing Novaya Zemlya in Europe.|
|1861 map by A. J. Johnson, illustrating the modern convention, Caucasus crest, Ural River, Urals.|
|1914 map showing the boundary along the Manych River, placing Stavropol Krai in Asia|
|Miles Clark in his 1992 "circumnavigation of Europe" followed the White Sea – Baltic Canal until Lake Onega and the Volga–Baltic Waterway to the Rybinsk Reservoir before joining the classical boundary along the Volga and Don rivers.|
The modern border between Asia and Europe remains a historical and cultural construct, defined only by convention. The modern border follows the Aegean Sea, the Dardanelles-Sea of Marmara-Bosphorus (together known as the Turkish Straits), the Black Sea, along the watershed of the Greater Caucasus, the northwestern portion of the Caspian Sea and along the Ural River and Ural Mountains to the Kara Sea, as mapped and listed in most atlases including that of the National Geographic Society and as described in the World Factbook. According to this definition, Georgia and Azerbaijan both have most of their territory in Asia, although each has small parts of their northern borderlands north of the Greater Caucasus watershed and thus in Europe.
Though most geographic sources assign the area south of the Caucasus Mountain crest to Southwest or West Asia, no definition is entirely satisfactory, with it often becoming a matter of self-identification. Cultural influences in the area originate from both Asia and Europe. While geographers rarely define continents primarily politically, Georgia and to a lesser extent Armenia and Azerbaijan are increasingly in the 21st century politically oriented towards Europe, but Armenia has a great cultural diaspora to the south, and Azerbaijan shares a cultural affinity with Iranian Azerbaijan as well as with the Turkic countries of Central Asia.
The Turkish city Istanbul lies in on both sides of the Bosporus (one of the Turkish Straits), making it a transcontinental city. Russia and Turkey are transcontinental countries with territory in both Europe and Asia by any definition except that of Eurasia as a single continent. While Russia is historically a European country with a history of imperial conquests in Asia, the situation for Turkey is inverse, as that of an Asian country with imperial conquests in Europe. Kazakhstan is also a transcontinental country by this definition, its West Kazakhstan and Atyrau provinces extending on either side of the Ural River.
This Ural River delineation is the only segment not to follow a major mountain range or wide water body, both of which often truly separate populations. However, the Ural River is the most common division used by authorities, is the most prominent natural feature in the region, and is the "most satisfactory of those (options) proposed" which include the Emba River, a much smaller stream cutting further into Central Asian Kazakhstan. The Ural River bridge in Orenburg is even labeled with permanent monuments carved with the word "Europe" on one side, "Asia" on the other.
The Kuma–Manych Depression (more precisely, the Manych River, the Kuma–Manych Canal and the Kuma River) remains cited less commonly as one possible natural boundary in contemporary sources. This definition peaked in prominence in the 1800s, however it has declined in usage since then, as it places traditionally European areas of Russia such as Stavropol, Krasnodar, and even areas just south of Rostov-on-Don in Asia.
- listed as part of Eastern Europe: Russian Federation
- listed as part of Central Asia: Kazakhstan
- listed as part of Western Asia: Azerbaijan, Georgia, and Turkey
According to UNSD, the aforementioned "assignment of countries or areas to specific groupings is for statistical convenience and does not imply any assumption regarding political or other affiliation of countries or territories". Furthermore, the UNSD classification often differs from those of other United Nations organizations. For instance, while UNSD includes Georgia and Cyprus in Western Asia, the United Nations Industrial Development Organization and UNESCO include both countries in Europe.
The Council of Europe includes the Eurasian countries of Armenia, Azerbaijan, Cyprus, Georgia, Russia and Turkey. It notes that "two Council of Europe member States, Turkey and Russia, belong geographically to both Europe and Asia and are therefore Eurasian. Strictly speaking, the three South Caucasus States, Armenia, Azerbaijan and Georgia are located in Asia, yet their membership of political Europe is no longer in doubt." 
Cyprus is an island of the Mediterranean located close to Asia Minor, so that it is usually associated with Asia and/or the Middle East, as in the World Factbook and the United Nations geoscheme, but the Republic of Cyprus was nevertheless admitted to the Council of Europe in 1961 and joined the EU in 2004. The northern part of the island functions as the unrecognized (except by Turkey) Turkish Republic of Northern Cyprus.
Europe and North AmericaEdit
Europe and North America are separated by the North Atlantic. In terms of associating islands with either continent, the boundary is usually drawn between Greenland and Iceland. The Norwegian islands of Jan Mayen and Svalbard in the Arctic Ocean are usually associated with Europe. Iceland and the Azores are protrusions of the Mid-Atlantic Ridge and are associated with and peopled from Europe, even though they have areas on the North American Plate. (Definitions of "continents" are a physical and cultural construct dating back centuries, long before the advent or even knowledge of plate tectonics; thus, defining a "continent" falls into the realm of physical and cultural geography, while continental plate definitions fall under plate tectonics in the realm of geology.)
The geographical notion of a continent stands in opposition to islands and archipelagos. Nevertheless, there are some islands that are considered part of Europe in a political sense. This most notably includes the British Isles (part of the European continental shelf and during the Ice Age of the continent itself), besides the islands of the North Sea, the Baltic Sea and the Mediterranean which are part of the territory of a country situated on the European mainland, and usually also the island states of Iceland and Malta.
Russia's Vaygach Island and Novaya Zemlya extend northward from the northern end of the Ural Mountains and are a continuation of that chain into the Arctic Ocean. While Novaya Zemlya was variously grouped with Europe or with Asia in 19th-century maps it is now usually grouped with Europe, the continental boundary considered to join the Arctic Ocean along the southern shore of the Kara Sea. The Russian Arctic archipelago of Franz Josef Land farther north is also associated with Europe.
Europe ends in the west at the Atlantic Ocean, although Iceland and the Azores archipelago (in the Atlantic, between Europe and North America) are usually considered European, as is the Norwegian Svalbard archipelago in the Arctic Ocean. Greenland is geographically part of North America, but politically associated with Europe as it is part of the Kingdom of Denmark, although it has extensive home rule and EU law no longer applies there.
Africa and AsiaEdit
Historically, in Greco-Roman geography, Africa (Libya) was taken to begin in Marmarica, at the Catabathmus Magnus, placing Egypt in Asia entirely. The idea of Egypt being an "African" country seems to develop in around the mid-19th century; the term Africa was classically reserved for what is now known as the Maghreb, to the explicit exclusion of Egypt, but with the exploration of Africa the shape of the African landmass (and Egypt's "natural" inclusion in that landmass) became apparent. In 1806, William George Browne still titled his travelogue Travels in Africa, Egypt, and Syria. Similarly, James Bruce in 1835 published Travels through part of Africa, Syria, Egypt, and Arabia. On the other hand, as early as 1670 John Ogilby under the title Africa published "an accurate Description of the Regions of Egypt, Barbary, Libya, and Billedulgerid, the Land of Negroes, Guinea, Æthiopia, and the Abyssines, with all the adjacent Islands, either in the Mediterranean, Atlantic, Southern, or Oriental Seas, belonging thereunto".
The usual line taken to divide Africa from Asia today is at the Isthmus of Suez, the narrowest gap between the Mediterranean and Gulf of Suez, the route today followed by the Suez Canal. This makes the Sinai Peninsula geographically Asian, and Egypt a transcontinental country.
Less than 2% of Egyptian population live in the Sinai, and hence Egypt even though technically transcontinental is usually considered an African country, as well as an Arab country. But when discussing the geopolitical region of the Middle East and North Africa, Egypt is usually grouped with the Western Asian countries as part of the Middle East, while Egypt's western neighbor Libya is grouped with the remaining North African countries as the Maghreb. However, they are both members of the Arab League as well as the African Union.
The Seychelles, Mauritius, and Comoros are island nations in the Indian Ocean associated with Africa. The island of Socotra may be considered African as it lies on this continent's shelf, but is part of Yemen, an Asian country.
North and South AmericaEdit
The border between North America and South America is at some point on the Isthmus of Panama. The most common demarcation in atlases and other sources follows the Darién Mountains watershed divide along the Colombia-Panama border where the isthmus meets the South American continent. Virtually all atlases list Panama as a state falling entirely within North America and/or Central America.
Often most of the Caribbean islands are considered part of North America, but Aruba, Bonaire, Curaçao and Trinidad and Tobago lie on the continental shelf of South America. On the other hand, the Venezuelan Isla Aves and the Colombian San Andrés and Providencia lie on the North American shelf.
Asia and North AmericaEdit
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The Bering Strait and Bering Sea separate the landmasses of Asia and North America, as well as forming the international boundary between Russia and the United States. This national and continental boundary separates the Diomede Islands in the Bering Strait, with Big Diomede in Russia and Little Diomede in the US. The Aleutian Islands are an island chain extending westward from the Alaska Peninsula toward Russia's Komandorski Islands and Kamchatka Peninsula. Most of them are always associated with North America, except for the westernmost Near Islands group, which is on Asia's continental shelf beyond the North Aleutians Basin and on rare occasions could be associated with Asia, which could then allow the U.S. state of Alaska to be considered a transcontinental state.
St. Lawrence Island in the northern Bering Sea belongs to Alaska and may be associated with either continent but is almost always considered part of North America, as with the Rat Islands in the Aleutian chain. At their nearest points, Alaska and Russia are separated by only 4 kilometres (2.5 miles).
The Americas and OceaniaEdit
The Galápagos Islands and Malpelo Island in the eastern Pacific Ocean are possessions of Ecuador and Colombia, respectively, and associated with South America. The uninhabited French possession of Clipperton Island 1,000 kilometres (600 miles) off the Mexican coast is associated with North America.
Asia and OceaniaEdit
The Malay Archipelago is sometimes divided between Asia and Australasia, usually along the anthropologic Melanesian line or Weber's Line. Indonesia controls the western half of New Guinea, geographically part of Australasia. The eastern half of the island is part of Papua New Guinea which is considered to be part of the Oceania. Indonesia is commonly referred to as one of the Southeast Asian countries. East Timor, an independent state that was formerly a territory of Indonesia, which is geographically part of Asia, is classified by the United Nations as part of the "South-Eastern Asia" block. It is expected to join the Association of Southeast Asian Nations, having been involved as an ASEAN Regional Forum member since independence, and has participated in the Southeast Asian Games since 2003. Occasionally, all of the Malay Archipelago is included in Oceania, although this is extremely rare, especially as most of the archipelago lies on the Asian continental shelf.
Antarctica along with its outlying islands have no permanent population. All land claims south of 60°S latitude are held in abeyance by the Antarctic Treaty System.
The South Georgia and the South Sandwich Islands are closer to Antarctica than to any other continent. However, they are politically associated with the inhabited Falkland Islands which are closer to South America. Furthermore, Argentina, a South American country, maintains its irredentist claims on the islands. The continental shelf boundary separates the two island groups.
The Prince Edward Islands are located between Africa and Antarctica, and are the territory of South Africa, an African country. The Australian Macquarie Island and the New Zealand Antipodes Islands, Auckland Islands, and Campbell Islands, are all located between the Oceanian countries of Australia and New Zealand and Antarctica.
Australia's Heard Island and McDonald Islands and the French Kerguelen Islands are located on the Kerguelen Plateau, on the Antarctic continental plate. The French Crozet Islands, Île Amsterdam, Île Saint-Paul, and the Norwegian Bouvet Island are also located on the Antarctic continental plate, and are not often associated with other continents.
- List of countries bordering on two or more oceans
- List of transcontinental countries
- List of former transcontinental countries
- Tricontinental Chile
- List of sovereign states and dependent territories by continent
- Continental divide
- Borders of the oceans
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- Geographia 7.5.6 (ed. Nobbe 1845, vol. 2, p. 178)) Καὶ τῇ Εὐρώπῃ δὲ συνάπτει διὰ τοῦ μεταξὺ αὐχένος τῆς τε Μαιώτιδος λίμνης καὶ τοῦ Σαρματικοῦ Ὠκεανοῦ ἐπὶ τῆς διαβάσεως τοῦ Τανάϊδος ποταμοῦ. "And [Asia] is connected to Europe by the land-strait between Lake Maiotis and the Sarmatian Ocean where the river Tanais crosses through."
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- Standard country or area codes and geographical regions for statistical use
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"Americas" Standard Country and Area Codes Classifications (M49), United Nations Statistics Division
"North America" Archived 3 March 2008 at the Wayback Machine. Atlas of Canada
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