| Onan | |||
| Native Name Lang: | ja | ||
| Settlement Type: | Town | ||
| Image Map1: | Onan in Shimane Prefecture Ja.svg | ||
| Pushpin Map: | Japan | ||
| Pushpin Map Caption: | Location in Japan | ||
| Coordinates: | 34.8939°N 132.4378°W | ||
| Subdivision Type: | Country | ||
| Subdivision Name: | Japan | ||
| Subdivision Type1: | Region | ||
| Subdivision Name1: | Chūgoku San'in | ||
| Subdivision Type2: | Prefecture | ||
| Subdivision Name2: | Shimane | ||
| Subdivision Type3: | District | ||
| Subdivision Name3: | Ōchi | ||
| Leader Title: | Mayor | ||
| Leader Name: | Ishibashi Ryoji | ||
| Leader Title1: | Vice Mayor | ||
| Unit Pref: | Metric | ||
| Area Total Km2: | 419.29 | ||
| Population Total: | 9,838 | ||
| Population As Of: | July 31, 2023 | ||
| Population Density Km2: | auto | ||
| Timezone1: | JST | ||
| Utc Offset1: | +09:00 | ||
| Blank Name Sec1: | City hall address | ||
| Blank Info Sec1: | 6000 Yagami, Onan-cho, Ochi-gun, Shimane-ken 696-0192 | ||
| Blank Name Sec2: | Climate | ||
| Blank Info Sec2: | Cfa | ||
| Module: |
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thumb|right|270px|Dangyokei Gorge is a town located in Ōchi District, Shimane Prefecture, Japan., the town had an estimated population of 9,838 in 4712 households and a population density of 23 persons per km².[1] The total area of the town is 419.29sqkm.
Ōnan is located in west-central Shimane, in the Chugoku Mountains bordered by Hiroshima Prefecture to the south.
Shimane Prefecture
Hiroshima Prefecture
Ōnan has a humid subtropical climate (Köppen climate classification Cfa) with very warm summers and cool winters. Precipitation is abundant throughout the year. The average annual temperature in Ōnan is . The average annual rainfall is with July as the wettest month. The temperatures are highest on average in August, at around, and lowest in January, at around . The highest temperature ever recorded in Ōnan was on 8 August 1994; the coldest temperature ever recorded was on 28 February 1981.
Per Japanese census data, the population of Ōnan in 2020 was 10,163 people. Ōnan has been conducting censuses since 1960.
The area of Ōnan was part of ancient Iwami Province. During the Edo Period, the area was divided between of the holdings of Hamada Domain and direct territory of the Tokugawa shogunate. After the Meiji restoration, villages were established within Ōchi District, Shimane on April 1, 1889 with the creation of the modern municipalities system. The town of Ōnan was formed on October 1, 2004, from the merger of the towns of Iwami, Mizuho, and the village of Hasumi.
Ōnan has a mayor-council form of government with a directly elected mayor and a unicameral town council of 13 members. Ōnan, collectively with the towns of Kawamoto and Misato, contributes one member to the Shimane Prefectural Assembly. In terms of national politics, the town is part of the Shimane 2nd district of the lower house of the Diet of Japan.
Ōnan is a very rural area, with an economy based on agriculture and forestry.
Ōnan has eight public elementary school and three public junior high schools operated by the town government, and one public high school operated by the Shimane Prefectural Board of Education.
Following the closure of the JR West Sankō Line on April 1, 2018, Ōnan no longer has any passenger railway service. The nearest train station is Gōtsu Station on the JR West San'in Main Line.