Aso (阿蘇郡, Aso-gun) is a district located in Kumamoto Prefecture, Japan.
As of the Aso and Yamato mergers (but with 2003 population data), the district has an estimated population of 40,841 and a density of 58.1 persons per square kilometer. The total area is 703.01 km2.
The Aso clan comes from it

Ōshima is a district located in Kagoshima Prefecture, Japan.
Takachiho is a town in Nishiusuki District, Miyazaki Prefecture, Japan. As of 1 October 2023, the town has an estimated population of 11,065 in 4865 households, and a population density of 47 persons per km2. The total area of the town is 237.54 square kilometres (91.71 sq mi).
Aso is a city located in Kumamoto Prefecture, Japan. As of 31 July 2024, the city had an estimated population of 24,240 in 11741 households, and a population density of 64 persons per km2. The total area of the city is 376.30 km2 (145.29 sq mi).
Soyō was a town located in Aso District, Kumamoto Prefecture, Japan.
Takamori is a town located in Aso District, Kumamoto Prefecture, Japan. As of 1 August 2024, the town had an estimated population of 5889 in 2965 households, and a population density of 34 persons per km2. The total area of the town is 175.06 km2 (67.59 sq mi).
Hakusui was a village located in Aso District, Kumamoto Prefecture, Japan.
Kugino was a village located in Aso District, Kumamoto Prefecture, Japan.
Chōyō was a village located in Aso District, Kumamoto Prefecture, Japan.
Nishihara is a village located in Aso District, Kumamoto Prefecture, Japan. As of 31 August 2024, the village had an estimated population of 7035 in 3044 households, and a population density of 91 persons per km2. The total area of the village is 77.22 km2 (29.81 sq mi).
Kashima is a town located in Kamimashiki District, Kumamoto Prefecture, Japan. As of 31 July 2024, the town had an estimated population of 10,203 in 4135 households, and a population density of 24 persons per km2. The total area of the town is 16.65 km2 (6.43 sq mi).
Yabe was a town located in Kamimashiki District, Kumamoto Prefecture, Japan.
Seiwa was a village located in Kamimashiki District, Kumamoto Prefecture, Japan.

Kamimashiki is a district located in Kumamoto Prefecture, Japan.
The Kita District is a district located in Ehime Prefecture, Japan.
Abu is a district located in Yamaguchi Prefecture, Japan.
Minamiaso is a village in Aso District, Kumamoto Prefecture, Japan. As of 31 July 2024, the village had an estimated population of 10,071 in 4821 households, and a population density of 73 persons per km2. The total area of the village is 137.32 km2 (53.02 sq mi).
Yamato is a town in Kamimashiki District, Kumamoto Prefecture, Japan. As of 31 July 2024, the town had an estimated population of 13,032 in 6274 households, and a population density of 24 persons per km2. The total area of the town is 544.67 km2 (210.30 sq mi).
Minamiaso Mizu-no-Umareru-Sato Hakusui-Kōgen Station, usually abbreviated to Hakusui-Kōgen Station, is a railway station located in Minamiaso, Kumamoto, Japan. It is an ancient site of a well in the foothills of Japan's largest volcano, Mount Aso.
32°52′22″N131°05′19″E / 32.8728°N 131.0885°E