description Lake Mashu Overview
Lake Mashu is a caldera lake located in Akan National Park on the eastern side of Hokkaido, Japan. It is renowned for its exceptional water clarity, with historical transparency measurements exceeding 40 meters, placing it among the clearest lakes on Earth. The lake has no inlet or outlet, and its water level is maintained by underground seepage and precipitation.
insights Ranking position
Lake Mashu ranks #39 of 214 in the Lake ranking, behind Lake Thun, ahead of Loch Lomond.
help Lake Mashu FAQ
Where is Lake Mashu located in Japan?
Lake Mashu is a caldera lake located within Akan National Park on the eastern side of Hokkaido. It sits in a volcanic crater formed thousands of years ago.
How clear is the water in Lake Mashu?
The lake is renowned for its exceptional water clarity, with historical transparency measurements exceeding 40 meters. This places it among the clearest lakes on Earth, often competing with Lake Baikal.
Why is Lake Mashu often covered in fog?
Due to its deep caldera walls and the temperature differences between the water and the air, the lake frequently experiences thick fog. This has given rise to local folklore and superstitions about the lake.
Can you swim or fish in Lake Mashu?
No, public access to the water's edge is strictly prohibited to preserve its pristine water quality, meaning there is no swimming, boating, or fishing allowed. Visitors can only view the lake from designated observation decks on the caldera rim.
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