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Lake Mashū
(Ainu: Kamuy-to) is a endorheic crater lake formed in the caldera of a potentially active volcano. It is located in Akan National Park on the island of Hokkaidō, Japan. The lake has been called the clearest lake in the world.
==Hydrology==
Lake Mashū is surrounded by steep crater walls high. It has no significant inlets and no outlet. The lake is one of the clearest in the world and one of the deepest in Japan. On August 1, 1931 the transparency of the water was measured at . Lake Baikal was measured around the same time measured . This is the lake's claim to clearest in the world.〔 Since the 1950s the transparency has tended to range between . The loss in transparency is probably due to the introduction of sockeye salmon and rainbow trout into the lake and landslides.〔NHK World HD Channel〕 At the same time, the clarity of Lake Baikal has not been measured.
In summer, the surface of Lake Mashū is often obscured by fog. This has given the lake a reputation for mysteriousness.〔 Local legend says that if you can see the surface of the lake, you will have bad luck.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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