What the records say
- When
- 11th century
- Kind
- Volcanic eruption
- Coordinates
- 43.57° N, 144.56° E
- Vei
- 5
- Date uncertainty
- ± 100 years
- Vent
- Kamuinupuri
- Unit
- Tephra layer Ma-b
- Dated by
- Isotopic: 14C (calibrated)
- Volcano number
- 285081
Lake Mashū
Crater lake in Akan Mashu National Park, Hokkaido island, Japan
Lake Mashū is an endorheic crater lake formed in the caldera of a potentially active volcano. It is located in Akan Mashu National Park on the island of Hokkaido, Japan. It has been called the clearest lake in the world.
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The source
- Smithsonian GVP Volcanoes of the World: Holocene eruptionsGlobal Volcanism Program, Smithsonian InstitutionSmithsonian terms of use: personal, educational and non-commercial use, with creditGlobal Volcanism Program, Smithsonian Institution: Volcanoes of the World v5.3, https://doi.org/10.5479/si.GVP.VOTW5-2025.5.3Source page