|Surface area||0.5 km²|
|Max. depth||15.2 m|
|Shore length1||6.8 km|
|Surface elevation||900 m|
|1 Shore length is not a well-defined measure.|
It is the smallest of the Fuji Five Lakes in terms of surface area, and third deepest, with a maximum water depth of 15.2 metres (50 ft). Its surface elevation of 900 metres (3,000 ft) is the same as for Lake Motosu and Lake Sai, 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. 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.
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 and wakasagi were introduced to the lake in the Meiji period, and sports fishing is also popular. The water of the lake lacks transparency and has a tendency towards a greenish hue due to algae.
- Rafferty, John P. Plate Tectonics, Volcanoes, and Earthquakes. Rosen Publishing (2010), ISBN 1615301062
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