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Lake Cerknica
Lake Cerknica (; (スロベニア語:Cerkniško jezero), (ドイツ語:Zirknitzer See)) is an intermittent lake in the southern part of the Cerknica Polje, a karst polje in Inner Carniola, a region in southwestern Slovenia. The lake, oriented in the Dinaric direction from northwest to southeast, is present for the most part of the year.〔 When full, it is the largest lake in the country. The plain is surrounded by the Javornik Hills () to the south and Slivnica () to the north, both belonging to Dinaric Alps. The area of the lake mainly reaches , but can reach up to and the surface level varies from to above sea level. The lake is an important wildlife resort, especially as a nesting place for many bird species. Botanically, it is distinguished by amphibious plants. It is therefore a part of two Natura 2000 areas of protection〔(Projektno območje ). Project Life. Notranjska Regional Park. Accessed 2009-12-16. (in Slovene)〕 and the focus of the Inner Carniola Regional Park, which covers additional Natura 2000 areas in the broader region.〔(Notranjska Regional Park ) - informative leaflet. Accessed 2009-12-16.〕 The climate in the area is continental, with a mean temperature of and the annual precipitation about . The largest settlement at the border of the lake is Cerknica, located north of the lake. Various watersports, including windsurfing, are popular on the lake.
== Intermittent behavior ==
The lake, which under ordinary conditions has an area of about and a mean depth of , communicates through a number of openings with a series of subterranean reservoirs or caverns, some of which are above the lake level in the surrounding hills. In the autumn, when the rainfall is slight, the lake is completely drained into the reservoirs lying below its level, and its bed is speedily covered with rich vegetation. With the returning heavy rains, the surrounding higher reservoirs are filled and discharge suddenly through the subterranean passages into the lake, so that the latter very rapidly regains its ordinary volume and may even inundate the surrounding country. The changes in level are, however, very irregular. Sometimes the lake does not disappear for several years, and it can remain dry for over a year, as it did in 1834–35. It is rich in fish, which disappear and return with the water.
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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