is a city in Yamaguchi Prefecture, Japan. , the city had an estimated population of 137,019 in 6828 households and a population density of 210 persons per km². The total area of the city is .

Geography 
Shūnan is located in south-central Yamaguchi Prefecture, bordered by the Seto Inland Sea to the south.  Together with the cities of Kudamatsu and Hikari, with which it has strong ties in terms of industry, economy, and population exchange; the three cities are informally called the "Shunan District". The coastal area is part of the Seto Industrial Complex, with many chemical plants, refineries and heavy industry. The northern part, on the other hand, is part of the Chugoku Mountains, dotted with rural areas.

Neighbouring municipalities 
Yamaguchi Prefecture
 Yamaguchi 
 Hōfu
 Iwakuni
 Hikari
Kudamatsu
Shimane Prefecture
Yoshika

Climate
Shūnan has a humid subtropical climate (Köppen climate classification Cfa) with very warm summers and cool winters.  The average annual temperature in Shūnan is 13.5 °C. The average annual rainfall is 1834 mm with September as the wettest month. The temperatures are highest on average in July, at around 24.9 °C, and lowest in January, at around 2.4 °C.

Demographics
Per Japanese census data, the population of Shūnan has been steady for the past 50 years.

History
The area of Shūnan was part of an ancient Suō Province.  Its name is derived from the first character (周) of the name of the former Suō Province (周防国), and the character for south (南), reflecting its location, comprising much of the southern part of the old province. During the Edo Period, the area was part of the holdings of Tokuyama Domain. Following the Meiji restoration, the village of Tokuyama within Tsuno District, Yamaguchi was established with the creation of the modern municipalities system on April 1, 1889.  Tokuyama as elevated to town status on October 15, 1900 and to city status on October 15, 1935.  Tokuyama expanded by annexing many neighboring villages on April1, 1942, April 1, 1944, October 1, 1955 and January 1, 1966. On April 21, 2003 the city of Shūnan was founded by the merger of the cities of  Tokuyama and Shinnan'yō, the town of Kumage (from Kumage District), and the town of Kano (from Tsuno District). Tsuno District was dissolved as a result of this merger.

Government
Shūnan has a mayor-council form of government with a directly elected mayor and a unicameral city council of 30 members. Shūnan contributes four members to the Yamaguchi Prefectural Assembly. In terms of national politics, the city is divided between the  Yamaguchi 1st district  and Yamaguchi 2nd district of the lower house of the Diet of Japan.

Economy
The main industry of Shūnan is the heavy and chemical industry. The Shūnan Petroleum Complex developed from the former Tokuyama Naval Arsenal. Major chemical manufacturers Tokuyama and Tosoh, petroleum wholesaler Idemitsu Kosan, and stainless steel processing company Nippon Steel Nisshin Steel have bases in the coastal area along Tokuyama Bay. The food processing company, Shimaya, has headquarters in Shunan.

Education
Shūnan has 27 public elementary school and 14 public junior high schools operated by the city government, and five public high school operated by the Yamaguchi Prefectural Board of Education. There are also one private middle school and one private high school. The prefecture also operates two special education schools for the handicapped. Shunan University is located in Shūnan

Transportation

Railway 
 JR West – San'yō Shinkansen

 JR West (JR West) - San'yō Main Line
  -  -  -  - 
 JR West (JR West) - Gantoku Line
  -  -  - <  -   -  >-

Highways 
  Chūgoku Expressway
  San'yō Expressway

Sister city relations
 Delfzijl, Netherlands (1990, Shinnan'yō)
 Townsville, Australia (1990, Tokuyama)
 São Bernardo do Campo, Brazil (1973, Tokuyama)

Sports
Before Tokuyama became part of Shūnan, it was one of the host cities of the official 1998 Women's Volleyball World Championship.

Notable people from Shūnan 
Satoshi Inoue, politician
Masahiko Kōmura, politician
Kodama Gentarō, Imperial Japanese Army general and 4th Governor General of Taiwan
Keiichi Hayashi, diplomat
Milk Morizono manga artist
Asami Imai, voice actress
Mayuko Fukuda, actress

See also
 Mitake

References

External links
 Shūnan City official website 

Cities in Yamaguchi Prefecture
Port settlements in Japan
Populated coastal places in Japan