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is a caldera lake in Akan National Park, eastern Hokkaidō, Japan. As with many geographic names in Hokkaidō, the name derives from the Ainu language. It is the largest caldera lake in Japan in terms of surface area, and sixth largest lake in Japan. It is also the largest lake in Japan to freeze over completely in winter. The name Lake Kutcharo is also sometimes used. The lake's central island, Nakajima (not to be confused with another island of the same name in
Lake Tōya is a volcanic caldera lake in Shikotsu-Toya National Park, Abuta District, Hokkaidō, Japan. It is part of "Toya Caldera and Usu Volcano Global Geopark" which joins in Global Geoparks Network. The stratovolcano of Mount Usu lies on the souther ...
), is a stratovolcano. It is also Japan's largest
recursive island A recursive island or lake is an island or a lake that lies within a lake or an island. For the purposes of defining recursion, small continental land masses such as Madagascar and New Zealand count as islands, while large continental land masses ...
.
Volcanic gases Volcanic gases are gases given off by active (or, at times, by dormant) volcanoes. These include gases trapped in cavities (vesicles) in volcanic rocks, dissolved or dissociated gases in magma and lava, or gases emanating from lava, from volcanic ...
render the lake water
acidic In computer science, ACID ( atomicity, consistency, isolation, durability) is a set of properties of database transactions intended to guarantee data validity despite errors, power failures, and other mishaps. In the context of databases, a ...
, and it supports few fish except in areas where inflowing streams dilute the water. Rainbow trout, which are also resistant to fairly acidic water, have been artificially introduced. In 1951, a rare form of
cicada The cicadas () are a superfamily, the Cicadoidea, of insects in the order Hemiptera (true bugs). They are in the suborder Auchenorrhyncha, along with smaller jumping bugs such as leafhoppers and froghoppers. The superfamily is divided into tw ...
('' Hyalessa maculaticollis'') was discovered, and is now protected by the government. The lake is also on the migratory path of the
whooper swan The whooper swan ( /ˈhuːpə(ɹ) swɒn/) (''Cygnus cygnus''), also known as the common swan, pronounced ''hooper swan'', is a large northern hemisphere swan. It is the Eurasian counterpart of the North American trumpeter swan, and the type speci ...
. Along the lake shore are several outdoor hot springs and a sand beach with naturally heated sand and hot ground water. Wakoto Peninsula extending into the lake has a number of active sulfurous vents. The lake is also known as Japan's
Loch Ness Loch Ness (; gd, Loch Nis ) is a large freshwater loch in the Scottish Highlands extending for approximately southwest of Inverness. It takes its name from the River Ness, which flows from the northern end. Loch Ness is best known for claim ...
, after numerous reported sightings on a lake monster dubbed Kusshii by the press from 1973. File:Lake Kussharo from Tsubetsu pass deck 2009.jpg, Viewed from Tsubetsu Mountain pass File:Lake Kussharo02.JPG, Viewed from Mt. Mokoto Prospects Park File:Kussharoko-Nakajima.jpg, Nakajima island ( Lava dome) File:Lake kussharo sunayu with swan.jpg, Whooper swans at Lake Kussharo


See also

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Tourism in Japan Japan attracted 31.88 million international tourists in 2019. Japan has 21 World Heritage Sites, including Himeji Castle, Historic Monuments of Ancient Kyoto and Nara. Popular foreigner attractions include Tokyo and Hiroshima, Mount F ...


References


External links

* Geological Survey of Japan *

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Kussharo Caldera


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- Teshikaga Town {{DEFAULTSORT:Kussharo Calderas of Hokkaido Volcanic crater lakes Lakes of Hokkaido Pleistocene calderas VEI-6 volcanoes