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Poyang Lake (, Gan: Po-yong U), located in Jiangxi Province, is the largest freshwater lake in China.〔http://english.people.com.cn/200202/21/eng20020221_90777.shtml ''People's Daily Online'' "Spring Fishing Ban on China's Largest Freshwater Lake"〕 The lake is fed by the Gan, Xin, and Xiu rivers, which connect to the Yangtze through a channel. The area of Poyang Lake fluctuates dramatically between the wet and dry seasons, but in recent years the size of the lake has been decreasing overall. In a normal year the area of the lake averages . In early 2012, due to drought and the practice of storing water at the Three Gorges Dam the area of the lake reached a low of about .〔http://www.guardian.co.uk/environment/2012/jan/31/china-freshwater-lake-dries-up ''The Guardian'' "China's largest freshwater lake dries up"〕 The lake provides a habitat for half a million migratory birds〔http://www.globalnature.org/docs/02_vorlage.asp?id=15793&sp=E&m1=11089&m2=11093&m3=11178&m4=15621&m5=15793&m6=&domid=1011 Global Nature Fund: "Detailed Data Lake Poyang-hu"〕 and is a favorite destination for birding. During the winter, the lake becomes home to a large number of migrating Siberian cranes, up to 90% of which spend the winter there. ==Formation== Poyang Lake has also been called Pengli Marsh (彭蠡澤) historically, but they are not the same. Before the Han Dynasty, the Yangtze followed a more northerly course through what is now Longgan Lake whilst Pengli Marsh formed the lower reaches of the Gan River. The area that is now Poyang Lake was a plain along the Gan River. Around 400 AD, the Yangtze River switched to a more southerly course, causing the Gan River to back up and form Lake Poyang. The backing up of the Gan River drowned Poyang County and Haihun County, forcing a mass migration to Wucheng Township in what is now Yongxiu County. Wucheng thus became one of the great ancient townships of Jiangxi Province. This migration gave birth to the phrase, "Drowning Haihun County gives rise to Wucheng Township" (). Lake Poyang reached its greatest size during the Tang Dynasty, when its area reached . 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「Poyang Lake」の詳細全文を読む スポンサード リンク
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