Mt. Showa (Showa Shin-Zan) is a volcanic lava dome in the Shikotsu-Toya National Park, Hokkaido, next to Mt. Usu.
The mountain is one of Japan's youngest mountains and was created between 1944 and 1945.
Initially, a series of strong earthquakes shook the area, and wheat fields were suddenly and rapidly uplifted.
Lava broke through the surface and the current peak was created. The peak is now 398 m height and still actively smoking.
You can see it and get good views of the young volcano by taking the Usuzan Ropeway.
The name Showa Shin-Zan literally means "Showa new mountain", as it formed during the reign of Emperor Showa known as the Showa period (1926-1989).