Aso Caldera, Aso Kujū National Park, Kumamoto Prefecture, Kyushu island, Japan. Containing rich farmland and 3 cities, Aso Caldera is 75 miles in circumference, one of the largest calderas in the world. Aso Caldera’s grasslands have been maintained by humans for 10,000 years through the grazing of domesticated animals and controlled burns. As the largest active volcano in Japan, Mount Aso (Asosan) most recently erupted in 2021 and 2016, in central Kyushu. From Asosankakohinankyukeisho Parking Lot accessible by toll road, we viewed a steaming lake in Nakadake Crater. Within an hour of our arrival in October 2024, the area was closed to visitors out of caution regarding risk of poisonous volcanic gases — a common occurrence at this active volcano.
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