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Farghana Valley : ウィキペディア英語版
Fergana Valley

The Fergana Valley (alternatively Farghana or Ferghana; (ウズベク語:Farg‘ona vodiysi), (キルギス語:Фергана өрөөнү), (:ferʁana œrœːny), (タジク語:водии Фaрғонa), (ロシア語:Ферганская долина), (ペルシア語: وادی فرغانه)) is a valley in Central Asia spread across eastern Uzbekistan, southern Kyrgyzstan and northern Tajikistan.
Divided into three republics of the former Soviet Union, the valley is ethnically diverse and in the early 21st century was the scene of ethnic conflict. A large triangular valley in what is an often dry part of Central Asia, the Fergana owes its fertility to two rivers, the Naryn and the Kara Darya, which run from the east, joining near Namangan, forming the Syr Darya river. The valley's history stretches back over 2300 years, when its population was conquered by Greco-Bactrian invaders from the west.
Chinese chroniclers date its towns to more than 2,100 years ago, as a path between Greek, Chinese, Bactrian and Parthian civilizations. It was home to Babur, founder of the Mughal Dynasty, tying the region to modern Afghanistan and South Asia. The Russian Empire conquered the valley at the end of the 19th century, and it became part of the Soviet Union in the 1920s. Its three Soviet republics gained independence in 1991. The area largely remains Muslim, populated by ethnic Uzbek, Tajik, and Kyrgyz people, often intermixed and not matching modern borders. Historically there have also been substantial numbers of Russian, Kashgarians, Kipchaks, Bukharan Jews and Romani minorities.
Mass cotton cultivation, introduced by the Soviets, remains central to the economy, along with a wide range of grains, fruits and vegetables. There is a long history of stock breeding, leatherwork, and a growing mining sector, including deposits of coal, iron, sulfur, gypsum, rock-salt, naphtha, and some small known oil reserves.
==Geography and geology==

The Fergana Valley is an intermountain depression in Central Asia, between the mountain systems of the Tien-Shan in the north and the Gissar-Alai in the south. The valley is approximately long and up to wide, forming an area covering . Its position makes it a separate geographic zone.〔(grida.no ): topography and hydrography of the Ferghana valley.〕 The valley owes its fertility to two rivers, the Naryn and the Kara Darya, which unite in the valley, near Namangan, to form the Syr Darya. Numerous other tributaries of these rivers exist in the valley including the Sokh River. The streams, and their numerous mountain effluents, not only supply water for irrigation, but also bring down vast quantities of sand, which is deposited alongside their courses, more especially alongside the Syr Darya where it cuts its way through the Khujand-Ajar ridge and forms the valley. This expanse of quicksand, covering an area of , under the influence of south-west winds, encroaches upon the agricultural districts.
The central part of the geological depression that forms the valley is characterized by block subsidence, originally to depths estimated at , largely filled with sediments that range in age as far back as the Permian-Triassic boundary. Some of the sediments are marine carbonates and clays. The faults are upthrusts and overthrusts. Anticlines associated with these faults form traps for petroleum and natural gas, which has been discovered in 52 small fields.

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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