With an elevation of 1,143 metres (3,750 ft)., Mount Aso has a climate that falls as humid continental ( Köppen climate classification " Dfb"), with warm summers and cold winters. Aso's pyroclastic flow deposits ( welded tuff) were utilized for bridge construction in the region, There are approximately 320 arched stone bridges in Kumamoto Prefecture, including the Tsujun-kyo and Reitai-kyo bridges on the Midorikawa River, which are important national cultural properties. Kishima are cones formed following the fourth above-mentioned huge caldera eruption. The fourth eruption (Aso 4) was the largest, with volcanic ash covering the entire Kyushu region and even extending to Yamaguchi Prefecture. As large amounts of pyroclastic flow and volcanic ash were emitted from the volcanic chamber, a huge depression (caldera) was formed as the chamber collapsed. Four large-scale eruptions (Aso 1 – 4) occurred during a period extending from 300,000 to 90,000 years ago. The eruption which formed the present somma occurred approximately 300,000 years ago.
The ash is carried from the volcanoes to the coastline by the Chikugo River, which has its source located on Aso as well. Several of the flats have been designated as Ramsar sites. Volcanic ash from Mount Aso and Mount Kujū plays a crucial role in maintaining and replenishing the tidal flats of the Ariake Sea, which are among the largest in Japan. Ejecta from the huge caldera eruption 90,800 years ago covers more than 600 km 3 and roughly equals the volume of Mount Fuji with a pyroclastic flow plateau that covered a significant part of Kyushu. Viewpoints from the somma overlooking the caldera are perched upon lava formed before the volcanic activity which created the present caldera. The caldera, one of the largest in the world, contains the city of Aso as well as Takamori and Minamiaso enclosing the caldera extends about 18 km east to west and about 25 km north to south. The present Aso Caldera formed as a result of four huge caldera eruptions occurring over a range of 90,000–300,000 years ago. Naka, the west side of which is accessible by road, contains an active volcano which continuously emits smoke and has occasional eruptions.
Kishima (also called Kishimadake or Kishima-Dake ). Naka (also called Nakadake or Naka-Dake), Mt. Taka (also called Takadake or Taka-Dake), Mt. The central cone group of Aso consists of five peaks, often called the "Five Mountains of Aso" (阿蘇五岳): Mt.
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