Determining the boundaries between continents is often a matter of geographical convention and consensus. Several slightly different conventions are in use, and the number of continents is most commonly considered seven in English-speaking countries. However, this number can range as low as four when Afro-Eurasia and the Americas are considered single continents.
Map of the Continents
Defining Continental Affiliations
An island can be associated with a continent by:
- Lying on the continent's adjacent continental shelf (e.g., Singapore, the British Isles).
- Being part of a microcontinent on the same principal tectonic plate (e.g., Madagascar and Seychelles).
- Geologically being associated with a continent (e.g., Bermuda, the Australian Indian Ocean Territories).
- Common geopolitical convention (e.g., Ascension Island, the South Sandwich Islands).
While the isthmus between Asia and Africa is navigable via the Suez Canal, and that between North and South America via the Panama Canal, these artificial channels are not generally accepted as continent-defining boundaries in themselves.
The Suez Canal and the Division Between Africa and Asia
The usual line taken to divide Africa from Asia today is at the Isthmus of Suez, the narrowest gap between the Mediterranean Sea and the Gulf of Suez, the route today followed by the Suez Canal. The Suez Canal traverses the Isthmus of Suez between the Mediterranean Sea and the Red Sea, dividing Africa and Asia.
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The Suez Canal divides Africa and Asia
This makes the Sinai Peninsula geographically Asian, and Egypt a transcontinental country. Less than 2% of the Egyptian population live on the Sinai Peninsula, and hence Egypt, even though technically transcontinental, is usually considered an African country entirely and not partly Asian.
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. Both are members of the African Union.
Historical Perspectives
Historically in Greco-Roman geography, "Africa" meant Ancient Libya, and its eastern extent was taken to be around Marmarica, at the Catabathmus Magnus. This was not considered to be a continent. As wider knowledge of geography developed, 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.
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European Territories in Africa
There are six definitive occurrences of territories unequivocally being a part of the African continent, but legally being administered by a European state. Three of these are administered by France, and the other three by Spain.
The existence of these territories further blurs the line between the borders of Africa and Europe, in particular with regard to the Spanish territories which lie immediately adjacent to and/or connected to the African mainland.
The uninhabited Spanish unincorporated overseas minor territories, known as the plazas de soberanía ("Localities of Sovereignty"), are small islands that lie immediately adjacent to the North African coastline, with the exception of Peñón de Vélez de la Gomera, which was originally an island like the other 'localities' but has subsequently become directly connected to the Moroccan (African) mainland.
Two of the French territories are the inhabited overseas departments and regions of Mayotte and Réunion. Mayotte is an island territory located west of the island country of Madagascar within the Mozambique Channel. Réunion is an island territory located near the island country of Mauritius and to the east of Madagascar (both nominally considered part of the African continent).
The final territory is the Scattered Islands in the Indian Ocean, administratively a part of the French Southern and Antarctic Lands.
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Transcontinental Countries and Island Affiliations
Indonesia's eastern region of Western New Guinea and nearby islands, makes it a transcontinental country; Western New Guinea is often considered part of Oceania because of its Indigenous Melanesian inhabitants and geological association with the Australian continental landmass.
East Timor, an independent state that was formerly a part of Indonesia, is classified by the United Nations as a part of the South-eastern Asia subregion.
The United Nations and The World Factbook categorize the Australian Indian Ocean external territories of Christmas Island and Cocos (Keeling) Islands (both geographically adjacent to Java) as being part of Oceania, rather than Asia. The islands lie within the bounds of the Australian Plate, and were uninhabited prior to European discovery in the 17th century.
Japan possesses the Bonin Islands (also known as the Ogasawara Islands), the Volcano Islands, and three remote islets (Nishinoshima, Minami-Tori-shima and Okinotorishima), all governed collectively as Ogasawara Village, which is an administrative division consisting of scattered island atolls located in the Pacific Ocean. Owing to the location and oceanic nature of these islands, they are sometimes considered to be a part of Oceania as well.
The islands are within the Oceanian biogeographical realm, unlike the rest of Japan, and may have been inhabited by Micronesians around 2,000 years ago. Their official discovery came much later in the 16th century, through Europeans.
The most remote island within this group, Minami-Tori-shima (also known as Marcus Island) is nearly 2,000 km removed from Tokyo, and is geographically closer to the Micronesian territories of Guam and Northern Mariana Islands.
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Asia Natural Hazards and Environmental Issues
Asia has a wide range of natural hazards and environmental issues.
Here is a table of the world's continents ranked by population, area, and density:
| Continent | Population (2025) | Area (Km²) | Density (P/Km²) | World Share |
|---|---|---|---|---|
| Asia | 4,835,320,061 | 31,033,131 | 156 | 58.7% |
| Africa | 1,549,867,585 | 29,648,481 | 52 | 18.8% |
| Europe | 742,556,239 | 22,134,710 | 34 | 9% |
| North America | 617,286,638 | 21,329,947 | 29 | 7.5% |
| South America | 438,105,376 | 17,461,112 | 25 | 5.3% |
| Australia/Oceania | 46,609,644 | 8,486,460 | 5 | 0.6% |
| Antarctica | 0 | 13,720,000 | 0 | 0% |
