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Lake Trasimeno ((イタリア語:Lago Trasimeno), (:ˌlaːɡo traziˈmɛːno); (ラテン語:Trasumennus); Etruscan ''Tarśmina''〔(The Etruscans - Page 265, Paolo Torelli - Rizzoli, 2001. )〕), also referred to as Trasimene or Thrasimene in English, is a lake in Italy, in the province of Perugia, in the Umbria region. The Lake is located in the south of the Po River and to the north of the nearby Tiber River, has a surface area of and it is the fourth for surface in Italy (it is slightly smaller than Lake Como). Only two minor streams flow directly into the Lake and none flows out. The water level of the lake fluctuates significantly according to rainfall levels and the seasonal demands from the towns, villages and farms near the shore. ==The lake== Trasimeno is shallow, muddy, rich in fish, including pike, carp, and tench. During the last 10 years has been 5 m deep on average. Lake Trasimeno is an endorheic body of water; it is an impounded lake that receives water but has no outlet. Other endorheic bodies of water include the Caspian Sea, Aral Sea, Utah's Great Salt Lake, and the Dead Sea. Evaporation can lead to a buildup of minerals in the water, resulting in saline conditions, making these lakes sensitive to pressures from pollution. The shallow waters meant that malarial mosquitoes prospered. To combat malaria, some mosquito larvae-eating fish were imported from USA during the 1950s. These fish are widely scattered, and some live in the lakes near Trasimeno. Although billions of larvae are eaten, there are still many mosquitoes and other insects. Trasimeno water quality is still very good, as a study by conservation group Italia Nostra showed in 2005. This is believed to be largely due to the small population and a lack of large farms in the area. A proposal to drain the lake to solve the problems of malaria and depth changes was rejected. At the end of the 19th century, the level changes were solved by building a channel near San Feliciano. This also lessened the malaria problem. 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「Lake Trasimeno」の詳細全文を読む スポンサード リンク
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