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The Wei River () is a major river in west-central China's Gansu and Shaanxi provinces. It is the largest tributary of the Yellow River and very important in the early development of Chinese civilization. The source of the Wei River is close to Weiyuan County''Wei yuan'' meaning "Wei's source"in Gansu province, less than from the Yellow River at Lanzhou. However, due to the sharp turn north the Yellow River takes in Lanzhou, the Wei and the Yellow River do not meet for more than further along the Yellow River's course. In a direct line, the Wei's source lies west of the main city along its course, Xi'an in Shaanxi province. The length of the river is and the area drained covers . The Wei River's tributaries include the Luo River, Jing River, and the Chishui River. ==History== The valley of the Wei was one of the early cradles of Chinese civilization, along which the capitals of the Zhou, Qin, Han, and Tang Dynasties were situated. The area of Dingxi around its headwaters in Gansu has numerous stone age sites from various early cultures. The Wei Valley is likely the earliest center of Chinese civilization, and also the location of China's first major irrigation works.〔(''Encyclopædia Britannica'' Online Concise )〕 Some Chinese historians now believe the Wei is the ancient Jiang River that gave its name to the families of Shennong and the Yan emperor, two Chinese legendary heroes credited with the early development of agriculture there.〔Pulleybank, Edwin G. ''Early China'', 25. 2000.〕 The headwaters of the Wei River are also notable in the development of the Northern Silk Road. The Chinese segment of the Northern Silk Road connected Xi'an (then the capital of China) to the west via Baoji, Tianshui at the Wei's headwaters, Lanzhou, Dunhuang, and the Wushao Ling Mountain, before looping north of the Takla Makan on its way to Kashgar and the routes into Parthia.〔(C.Michael Hogan, ''Silk Road, North China'', The Megalithic Portal, ed. Andy Burnham )〕 In September 2003 extensive rainfall led to flooding that caused over 30 fatalities, and temporarily displaced over 300,000 persons.〔(''17,000 Houses Collapse, 200,000 Evacuated in Flood-Hit China'', Agence France-Presse 2 sept 03 )〕 Ecological aspects of the Wei River have been examined with respect to flow rates in the Wei River.〔(J.X Song, Z.X. Xu, C.M. Liu, H.E. Li, ''Ecological and environmental instream flow requirements for the Wei River - the largest tributary of the Yellow River'', 24 Jan. 2007 )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Wei River」の詳細全文を読む スポンサード リンク
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