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is the one of the Fuji Five Lakes and located in southern Yamanashi Prefecture near Mount Fuji, Japan. It is the fourth of the Fuji Five Lakes in terms of surface area, and second deepest, with a maximum water depth of . Its surface elevation of is the same as for Lake Motosu and Lake Shōji, confirming that these three lakes were originally a single lake, which was divided by an enormous lava flow from Mount Fuji during an eruption from 864-868 AD.〔Rafferty, Tectonics, Volcanoes, and Earthquakes. page 135〕 The remnants of the lava flow are now under the Aokigahara Jukai Forest, and there is evidence to indicate that these three lakes remain connected by underground waterways.〔 The lake is within the borders of the Fuji-Hakone-Izu National Park.〔(Fuji-Hakone-Izu National Park )(Ministry of the Environment (Japan))〕 Saiko has no natural drainage, but an artificial channel now connects it to Lake Kawaguchi. As with the other Fuji Five Lakes, the area is a popular resort, with many lakeside hotels, windsurfing facilities, camp sites, and excursion boats. Japanese crucian carp, ''wakasagi'' and ''Kunimasu'' were introduced to the lake in the Meiji period, and sports fishing is also popular. However, ''Kunimasu'', which had been introduced to a number of lakes in Japan in the Taisho period were believed to have died out and become extinct, with the last reported sighting in 1935, until rediscovered in Lake Sai in 2010.〔('Extinct' trout species rediscovered. Yomiuri Shimbun Dec. 16, 2010 )〕 West Lake in Hangzhou, China, is written with the same ''kanji'' as Lake Sai. ==See also== * Fuji Five Lakes * Fuji-Hakone-Izu National Park 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「Saiko Lake」の詳細全文を読む スポンサード リンク
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