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Key Facts about Mount Aso

Jan. 21, 2026

Authorities recently initiated an extensive search operation after a helicopter vanished while flying near a 'highly active' Mount Aso volcano in Japan.

About Mount Aso:

  • It is located in Kumamoto-ken (prefecture), Kyushu, Japan.
  • It is the largest active volcano in Japan.
  • It has the largest active crater in the world.
  • Its caldera (bowl-shaped volcanic depression) marks the original crater and contains the active volcano of Naka-dake and numerous hot springs.
  • The crater is inhabited and is crossed by roads and railways.
  • Its mountain pastures are used for cattle raising and dairy farming.
  • The volcano is the central feature of Aso-Kuju National Park.
  • The volcano has been erupting sporadically for decades, most recently in 2021.

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