By convention, “continents are understood to be large, continues , discrete masses of land, ideally separated by expanses of water”.
The criterion of a discrete landmass is completely disregarded if the continuous landmass of Eurasia is classified as two separate continents: Europe and Asia. Physiographically, Europe and South Asia are peninsulas of the Eurasian landmass. However, Europe is widely considered a continent with its comparatively large land area of 10,180,000 square kilometres (3,930,000 sq mi), while South Asia, with less than half that area, is considered a subcontinent.
The alternative view—in geology and geography—that Eurasia is a single continent results in a six-continent view of the world. Some view separation of Eurasia into Asia and Europe as a residue of Eurocentrism: “In physical, cultural and historical diversity, China and India are comparable to the entire European landmass, not to a single European country. […].” However, for historical and cultural reasons, the view of Europe as a separate continent continues in several categorizations.
If continents are defined strictly as discrete landmasses, embracing all the contiguous land of a body, then Africa, Asia, and Europe form a single continent which may be referred to as Afro-Eurasia. Combined with the consolidation of the Americas, this would produce a four-continent model consisting of Afro-Eurasia, America, Antarctica and Australia.
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.
Formerly Known As Europe
- listed as part of Eastern Europe: Russian Federation
- listed as part of Central Asia: Kazakhstan
- listed as part of Western Asia: Armenia, Azerbaijan, Cyprus, Georgia, and Turkey
[T]wo 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.https://en.wikipedia.org/wiki/Boundaries_between_the_continents_of_Earth