| Mount Ontake | |
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| 御嶽山 | |
Mount Ontake in spring |
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| Elevation | 3,067 m (10,062 ft) [1] |
| Listing | 100 famous mountains in Japan |
| Location | |
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Mount Ontake
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| Coordinates | [1] |
| Topo map | Geographical Survey Institute, 25000:1 御嶽山, 50000:1 御嶽山 |
| Geology | |
| Type | Stratovolcano |
| Last eruption | 1980 |
Mount Ontake (御嶽山 Ontake-san), also referred to as Mount Kiso Ontake (木曽御嶽山 Kiso Ontake-san), is the second highest volcano in Japan at 3,067 m (10,062 ft)[2] located around 100 km (62 mi) northeast of Nagoya. It is on the borders of Kiso and Ōtaki, Nagano Prefecture, and Gero, Gifu Prefecture. It should not be confused with Mount Mitake, a mountain in Tokyo written with the same characters, and various other Japanese mountains which share the name Ontake.
Thought to be inactive until 1979, it underwent a series of eruptions over the following year, but has not erupted since 1980.
The volcano has five crater lakes, with Ni no Ike (二ノ池) at 2,905 m (9,531 ft) being the highest mountain lake in Japan.
A small pond located near the base of Mount Ontake contains a number of koi that have achieved seemingly impossible life spans. The oldest known vertebrate animal known to recorded history was a koi named "Hanako," who died here in 1977, at the age of 226 years—outlasting the world's oldest tortoise by 38 years.[3].
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