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Lake Akan
is a lake in Kushiro, Hokkaidō, Japan. It is located in Akan National Park and is a Ramsar Site.〔(【引用サイトリンク】title=Ramsar Sites in Japan - Akan-ko )〕 ==History== Volcanic activity formed the lake some 6,000 years ago, when a dam was formed. The lake used to have a clarity of 8–9 meters in the 1930s. Pollution from local hotspring resorts has decreased the transparency to 3–4 meters.
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 Akan」の詳細全文を読む
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