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2024年9月26日 · Okinawa, ken (prefecture) of Japan, located in the Pacific Ocean. The prefecture is composed of roughly the southwestern two-thirds of the Ryukyu Islands, that archipelago forming the division between the East China Sea to the northwest and the Philippine Sea to the southeast. Naha is the prefectural capital.
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Japan, island country lying off the east coast of Asia. It consists of a great string of islands in a northeast-southwest arc that stretches for approximately 1,500 miles (2,400 km) through the western North Pacific Ocean. Nearly the entire land area is taken up by the country’s four main islands; from north to south these are Hokkaido (Hokkaidō), Honshu (Honshū), Shikoku, and Kyushu (Kyūshū). Honshu is the largest of the four, followed in size by Hokkaido, Kyushu, and Shikoku. In addition, there are numerous smaller islands, the major groups of which are the Ryukyu (Nansei) Islands (including the island of Okinawa) to the south and west of Kyushu and the Izu, Bonin (Ogasawara), and Volcano (Kazan) islands to the south and east of central Honshu. The national capital, Tokyo (Tōkyō), in east-central Honshu, is one of the world’s most populous cities.
The Japanese landscape is rugged, with more than four-fifths of the land surface consisting of mountains. There are many active and dormant volcanoes, including Mount Fuji (Fuji-san), which, at an elevation of 12,388 feet (3,776 metres), is Japan’s highest mountain. Abundant precipitation and the generally mild temperatures throughout most of the country have produced a lush vegetation cover and, despite the mountainous terrain and generally poor soils, have made it possible to raise a variety of crops. Japan has a large and, to a great extent, ethnically homogeneous population, which is heavily concentrated in the low-lying areas along the Pacific coast of Honshu.
Complexity and contrast are the keynotes of life in Japan—a country possessing an intricate and ancient cultural tradition yet one that, since 1950, has emerged as one of the world’s most economically and technologically advanced societies. Heavy emphasis is placed on education, and Japan is one of the world’s most literate countries. Tension between old and new is apparent in all phases of Japanese life. A characteristic sensitivity to natural beauty and a concern with form and balance are evident in such cities as Kyōto and Nara, as well as in Japan’s ubiquitous gardens. Even in the countryside, however, the impact of rapid Westernization is evident in many aspects of Japanese life. The agricultural regions are characterized by low population densities and well-ordered rice fields and fruit orchards, whereas the industrial and urbanized belt along the Pacific coast of Honshu is noted for its highly concentrated population, heavy industrialization, and environmental pollution.
Humans have occupied Japan for tens of thousands of years, but Japan’s recorded history begins only in the 1st century bce, with mention in Chinese sources. Contact with China and Korea in the early centuries ce brought profound changes to Japan, including the Chinese writing system, Buddhism, and many artistic forms from the continent. The first steps at political unification of the country occurred in the late 4th and early 5th centuries ce under the Yamato court. A great civilization then developed first at Nara in the 8th century and then at Heian-kyō (now Kyōto) from the late 8th to the late 12th century. The seven centuries thereafter were a period of domination by military rulers culminating in near isolation from the outside world from the early 17th to the mid-19th century.
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Japan is bounded to the west by the Sea of Japan (East Sea), which separates it from the eastern shores of South and North Korea and southeastern Siberia (Russia); to the north by La Perouse (Sōya) Strait, separating it from Russian-held Sakhalin Island, and by the Sea of Okhotsk; to the northeast by the southern Kuril Islands (since World War II under Soviet and then Russian administration); to the east and south by the Pacific; and to the southwest by the East China Sea, which separates it from China. The island of Tsushima lies between northwestern Kyushu and southeastern South Korea and defines the Korea Strait on the Korean side and the Tsushima Strait on the Japanese side.
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The mountainous character of the country is the outcome of orogenic (mountain-building) forces largely during Quaternary time (roughly, the past 2.6 million years), as evidenced by the frequent occurrence of violent earthquakes, volcanic activity, and signs of change in sea levels along the coast. There are no sizable structural plains and peneplains (large land areas leveled by erosion), features that usually occur in more stable regions of the Earth. The mountains are for the most part in a youthful stage of dissection in which steep slopes are incised by dense river-valley networks. Rivers are mostly torrential, and their valleys are accompanied by series of river terraces that are the result of movements in the Earth’s crust, as well as climatic and sea-level changes in Holocene times (i.e., the past 11,700 years). Recent volcanoes are juxtaposed with old and highly dissected ones. The shores are characterized by elevated and depressed features such as headlands and bays, which display an incipient stage of development.
The mountains are divided into many small land blocks that are separated by lowlands or deep saddles; there is no long or continuous mountain range. These land blocks are the result of intense faulting (movement of adjacent rock masses along a fracture) and warping (bending of the Earth’s crust); the former process is regarded as dominant. One consequence is that mountain blocks are often bounded by fault scarps and flexure slopes that descend in step formation to the adjacent lowlands.
Coalescing alluvial fans—cone-shaped deposits of alluvium that run together—are formed where rivers emerge from the mountains. When the rivers are large enough to extend their courses to the sea, low deltaic plains develop in front of the fans; this occurs most frequently where the rivers empty into shallow and sheltered bays, as in the deltas of Kantō (Kwanto), Nōbi, and Ōsaka. In most places, however, fan surfaces plunge directly into the sea and are separated by low, sandy beach ridges.
Dissected plains are common. Intense disturbances have caused many former alluvial fans, deltas, and sea bottoms to be substantially uplifted to form flat-topped uplands such as those found in the Kantō Plain. Frequently the uplands have been overlain with volcanic ash, as in the Kantō and Tokachi plains.
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2024年10月12日 · Labor Day, in the United States and Canada, holiday (first Monday in September) honoring workers and recognizing their contributions to society. In many other countries, May Day serves a similar purpose. Learn more about Labor Day, including its history.
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