Introduction to the landforms and geology of Japan by
Figure: Aso Caldera
Viewed from the southwest. The size of caldera is 24 × 18 km. The highest
post-caldera cone is Nakadake 1592 m high. Elevations range from 460 m to
570 m on the bottom of caldera and from 860 m to 1100 m on top of the rim.