It is in the rural, eastern region of Hakodate, Hokkaido, Japan.

Mount E is part of Esan Prefectural Natural Park.

[2] Mount E consists of non-alkali, mafic, volcanic rock.

This eruption consisted of phreatic explosions, and was rated a 1 on the VEI scale.

The eruption triggered lahars damaging several houses and causing fatalities.