Aso

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A·so

 (ä′sō′), Mount also A·so-san (ä′sō-sän′)
A volcanic mountain of central Kyushu, Japan. It is topped by one of the world's largest calderas, containing five volcanic cones, one of which is active. The highest cone rises to 1,592 m (5,223 ft).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Aso

(ˈɑːsəʊ)
n
(Placename) a group of five volcanic cones in Japan on central Kyushu, one of which, Naka-dake, has the largest crater in the world, between 16 km (10 miles) and 24 km (15 miles) in diameter. Highest cone: 1592 m (5223 ft). Also called: Asosan
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014