As mentioned in my last post, I currently am spending some time in Japan, in Kumamoto, Kyushu (i.e. southern Japan). The major attraction of Kumamoto, besides the ubiquitous Kumamon, is without a doubt Mt Aso. The Aso caldera (essentially a giant hole caused by the collapse of a volcano after an eruption, or more violently from an actual eruption) is one of the largest in the world. The signs on the volcano claims this is the largest caldera in the world, but I suspect that Toba is actually larger. Being inside of the caldera is impressive, like the inside of a steep bowl. The caldera formed in four major eruption episodes between 300,000 and 90,000 years ago, with the final eruption causing the majority of it. Here are some pictures of my visit from last weekend.