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The view from Mount Oakan (July 2008)
|Location||Kushiro, Hokkaidō, Japan|
|Primary outflows||Akan River|
|Catchment area||148 km2 (57 sq mi)|
|Surface area||13 km2 (3,200 acres)|
|Average depth||17.8 m (58 ft)|
|Max. depth||44.8 m (147 ft)|
|Water volume||0.23 km3 (0.055 cu mi)|
|Shore length1||25.9 km (16.1 mi)|
|Surface elevation||420 m (1,380 ft)|
|Frozen||December to April|
|Islands||4: Ōjima, Kojima, Yaitai Island, Chūrui Island|
|Designated||8 November 2005|
|1 Shore length is not a well-defined measure.|
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.
Flora and fauna
- Phragmites communis
- Nuphar sp.
- Potamogeton crispus
- Hydrilla verticillata
- Myriophyllum verticillatum
- Vallisneria gigantea
- Melosira italica
- Asterionella formosa
- List of Special Places of Scenic Beauty, Special Historic Sites and Special Natural Monuments
- Ramsar sites in Japan
- "Akan-ko". Ramsar Sites Information Service. Retrieved 25 April 2018.
- "Data Summary: Akan-ko (Lake Akan)". World Lakes Database. International Lake Environment Committee. Archived from the original on 2012-04-20. Retrieved 2009-05-18.
- "Ramsar Sites in Japan - Akan-ko" (PDF). Ministry of the Environment. Retrieved 24 March 2011.
- "AKAN-KO (LAKE AKAN)". World Lakes Database. International Lake Environment Committee. Archived from the original on 2012-03-05. Retrieved 2009-05-18.
|Wikimedia Commons has media related to Lake Akan.|