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 (ˌɑːsəʊˈsɑːn)
Aso in American English
(ˈɑsoʊ)
large volcanic crater in central Kyushu, Japan, with five cones: highest cone, 5,223ft (1,592 m); crater, c. 15 mi (24 km) wide