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Showa-shinzanToya and Showa-shinzan mapShowa-shinzan is a volcanic lava dome which is 398 meters high, and is located 2 km east Mount Usu.

Surprisingly, this mountain was formed for only 2 years from December 1943 to September 1945.
"Showa" means the period of Emperor Showa (1926-1989), and "shinzan" means "new mountain".

Originally here were the fields of wheat.
One day an earthquake caused, them suddenly the land began to rise and this mountain was formed for a short period.
It became a 407-meter-high mountain for a while.

At that time, Japan was in the Pacific War (World War II), therefore Japanese army forbade to survey and report this.

But Masao Mimatsu, a postmaster living nearby, had been observing and recording continuously.
In 1948, his valuable records were presented at a conference about volcano held in Oslo, then it received acclaim from many academians.

We can look up this mountain at the foot of one.
And there is Mimatsu Masao Volcano Memorial Museum which displays his records and other materials.

How to get to here

By route bus

About 15 minutes from "Toya-ko Onsen" (the hot spring resort of Lake Toya) to "Showashinzan".

By car

On the expressway, about 133km from Sapporo to Date Exit. It takes about 1 hour and 30 minutes.
Then about 10 km to Showashinzan.

Showa-shinzan and Lake Toya
Mimatsu Masao Volcano Memorial Museum
Showa-shinzan and the statue of Masao Mimatsu

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