Aso, a city in Kumamoto Prefecture, is located in the caldera of Mount Aso, Japan’s largest active volcano. Crossing over the mountain leads to picturesque farming villages. Related posts: Campbelltown Forest of Wild Birds A Slice of Oz in Sleepy Saitama Harbor City Coathangered! Sydney Opera House Among World Heritage List’s ‘Three Great Disappointments’ Kyushu’s Marsupial Park Aussies Exposed to Radiation in Japan – 65 Years Ago Powered by YARPP.