|Primary sources||Yangtze, Xiang, Zi, Yuan, Li|
|Surface area||2,820 km² (flood season: 20,000 km²)|
Dongting Lake or Lake Dongting (洞庭湖; Pinyin: Dòngtíng Hú; Wade-Giles: Tung-t'ing Hu) is a large, shallow lake in northeastern Hunan Province of China. It is a flood-basin of the Yangtze River (Chang Jiang); hence the lake's size depends on the season. The provinces of Hubei and Hunan are named after their location relative to the lake: Hubei means "North of the Lake" and Hunan means "South of the Lake" in Chinese.
Dongting Lake is home to the Finless Porpoise, which is endangered in China.
In the July-September period, flood water from the Yangtze flows into the lake, enlarging it greatly. The lake's area, which normally is 2,820 km², may increase to 20,000 km² in flood season, when vast amounts of water and sediment from the Chang Jiang flow into the lake. The lake is also fed by four rivers: the Xiang, Zi, Yuan (沅) and Li rivers. In addition, the Xiao River (瀟) flows into the Xiang near Changsha, before the Xiang flows into the lake. Ocean-going vessels can travel through the Xiang to reach Changsha.
During the Han Dynasty, Yunmeng Marsh (雲夢大澤; yun2 meng4 da4 ze2), which lies to the north of Dongting Lake in Hubei Province, served as the main flood-basin of the Yangtze. The rich sediment of the marsh attracted farmers. Embankments were built, keeping the river out, and the Dongting Lake area south of the Yangtze gradually became the river's main flood-basin.
At that time, Dongting Lake was China's largest lake. Because of its size, it gained the name Eight-hundred-li-Dongting (八百里洞庭). Nowadays, it is the second-largest, after Poyang Lake (鄱陽湖), as much of the lake has been lost to land reclamation.
Culture and mythologyEdit
A dragon-king is said to live at the bottom of the lake. The basin of Dongting Lake and its surrounding area is famous for its scenic beauty, which has been encapsulated in the phrase 瀟湘湖南 (Xiao1-Xiang1 Hu2nan2; "Hunan of the Xiao and Xiang rivers").
There have been calls for action to save the finless porpoise, of which there are about 1400 left living, with between 700 and 900 in the Yangtze, with about another 500 in Poyang and Dongting Lakes.
2007 population levels are less than half the 1997 levels, and the population is dropping at a rate of 7.3 per cent per year.
Pressure on the finless porpoise population on Poyang Lake comes from the high numbers of ships passing through and sand dredging. 
After flooding of the Yangtze River in late June 2007, approximately 2 billion mice were displaced from the islands of the lake. The mice invaded surrounding communities, damaging crops and dikes and forcing the government to construct walls and ditches to control the population. 
Billions of mice were forced from their holes and were sent scurrying into local villages with officials opened the sluice gates on Dongting Lake in June 2007 to relieve flooding. Villagers killed an estimated 2 billion mice by beating them with shovels or using poison. The rotting mouse corpses must be properly disposed and other animals - like cats and dogs - were the unintentional victims of the poisons.
A restoration project, the Sino-Norwegian Project of Biodiversity Protection Management, a joint Norwegian Chinese endeavor began in 2005. According to a 2007 article in the China Daily, "[The Dongting Lake area] will be restored to a sustainable biodiversity environment within five to 10 years".
Major cities on the Lake Edit
- ↑ http://www.chinadialogue.net/article/show/single/en/839-Poyang-Lake-saving-the-finless-porpoise www.chinadialogue.net - Poyang Lake saving the finless porpoise
- ↑ http://www.physorg.com/news103199287.html www.physorg.com - 2 Billion Chinese Mice Overrun Lake Area
- ↑ "Lake back to health in 5 to 10 years" (on the website of the Ministry of Water Resources of the People's Republic of China.)
Adapted from the Wikipedia article "Dongting Lake" http://en.wikipedia.org/w/index.php?title=Dongting_Lake&oldid=160826328