Aira Caldera

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What Wikipedia says

Aira Caldera is a gigantic volcanic caldera located on the southern end of Kyushu, Japan. It is believed to have been formed about 30,000 years ago with a succession of pyroclastic surges. It is currently the place of residence to over 900,000 people.

Excerpt from the Wikipedia article “Aira Caldera”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: NASA/JPL-Caltech, Public domain, via Wikimedia Commons.