![]() ![]() 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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