Aso-san (阿蘇山) in Kumamoto Prefecture is an active volcano whose eruptions formed the island of Kyushu (Japan's third largest island). It also holds the record for the world's largest volcanic caldera and is Japan's largest active volcano. Read about one hiker's experience and learn which trails to take.
4 comments
One minor point - most of Kyushu was formed by the subduction of the Philippine plate under the Eurasian plate, not by Aso's eruptions, which are relatively recent (
http://en.wikipedia.org/wiki/Island_Park_Caldera
http://geology.about.com/library/bl/blbigcalderas.htm
http://en.wikipedia.org/wiki/Lake_Toba