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Asia
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Asia ( or ) is the Earth's largest and most populous continent, located primarily in the eastern and northern hemispheres. Though it covers only 8.7% of the Earth's total surface area, it comprises 30% of Earth's land area, and has historically been home to the bulk of the planet's human population (currently roughly 60%). Asia is notable for not only overall large size and population, but unusually dense and large settlements as well as vast barely populated regions within the continent of 4.4 billion people. Asia has exhibited economic dynamism (particularly East Asia) as well as robust population growth during the 20th century, but overall population growth has since fallen to world average levels.〔.〕
The boundaries of Asia are traditionally determined as that of Eurasia which is not Europe, as there is no clear geographical separation between them, and Asia is in itself originally a European definition. The most commonly accepted boundaries place Asia to the east of the Suez Canal, the Ural River, and the Ural Mountains, and south of the Caucasus Mountains and the Caspian and Black Seas.〔 "Europe" (pp. 68–9); "Asia" (pp. 90–1): "A commonly accepted division between Asia and Europe is formed by the Ural Mountains, Ural River, Caspian Sea, Caucasus Mountains, and the Black Sea with its outlets, the Bosporus and Dardanelles."〕 It is bounded on the east by the Pacific Ocean, on the south by the Indian Ocean and on the north by the Arctic Ocean.
Given its size and diversity, the concept of Asia—a name dating back to classical antiquity—may actually have more to do with human geography than physical geography. Asia varies greatly across and within its regions with regard to ethnic groups, cultures, environments, economics, historical ties and government systems. It also has a mix of many different climates ranging from the equatorial south via the hot desert in the Middle East, temperate areas in the east and the extremely continental centre to vast subarctic and polar areas in Siberia.
== Definition and boundaries ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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