Mount Aso, is the largest active volcano in Japan, and is among the largest in the world. Aso has one of the largest calderas in the world (15.5 mi north-south, and 11 mi east-west). The caldera has a circumference of around 75 mi.
Mt ASO Volcano on Kyushu Island, Japan, is one of the world's most active volcanoes & has one of the longest recorded lists w/about 160 historic eruptions since 553 AD. Fatalities occurred due to bomb impacts & volcanic gasses in 1979 & 1997