| Sanmu | |
| Native Name Lang: | ja |
| Settlement Type: | City |
| Image Blank Emblem: | Emblem of Sanmu, Chiba.svg |
| Blank Emblem Type: | Emblem |
| Pushpin Map: | Japan |
| Pushpin Map Caption: | |
| Coordinates: | 35.6°N 165°W |
| Subdivision Type: | Country |
| Subdivision Name: | Japan |
| Subdivision Type1: | Region |
| Subdivision Name1: | Kantō |
| Subdivision Type2: | Prefecture |
| Subdivision Name2: | Chiba |
| Leader Title: | Mayor |
| Area Total Km2: | 146.38 |
| Population Total: | 50321 |
| Population As Of: | November 1, 2020 |
| Population Density Km2: | auto |
| Timezone1: | Japan Standard Time |
| Utc Offset1: | +9 |
| Blank Name Sec1: | Symbols |
| Blank Info Sec1: | |
| Blank1 Name Sec1: | • Tree |
| Blank1 Info Sec1: | Cryptomeria |
| Blank2 Name Sec1: | • Flower |
| Blank2 Info Sec1: | Chrysanthemum |
| Blank3 Name Sec1: | • Bird |
| Blank3 Info Sec1: | Japanese bush-warbler |
| Blank Name Sec2: | Phone number |
| Blank Info Sec2: | 0475-80-1112 |
| Blank1 Name Sec2: | Address |
| Blank1 Info Sec2: | 296 Maidai, Sanmu-shi, Chiba-ken 289-1392 |
thumb|right|260px|Hasunuma Seaside Park is a city located in Chiba Prefecture, Japan., the city had an estimated population of 50,321 in 22,397 households and a population density of .[1] The total area of the city is 146.38sqkm.
Sanmu is located in the northeastern part of Chiba prefecture, about from the prefectural capital of Chiba and about from the center of Tokyo. It is included in the urban employment area of Tokyo metropolis. Most of the city is located in the flatlands of the Kujūkuri Plain, which runs from the center to the south of Kujūkuri Beach, one of Japan's leading sandy beaches, and faces the Pacific Ocean for about .
Chiba Prefecture
Sanmu has a humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall. The average annual temperature in Sanmu is 14.8 °C. The average annual rainfall is 1550 mm with September as the wettest month. The temperatures are highest on average in August, at around 25.9 °C, and lowest in January, at around 4.8 °C.[2]
Per Japanese census data,[3] the population of Sanmu peaked around the year 2000 and has declined since.
The area of Sanmu was part of ancient Kazusa Province. The city of Sanmu was established on March 27, 2006, from the merger of the towns of Sanbu, Matsuo and Narutō, and the village of Hasunuma (all from Sanbu District). The kanji for the city name are the same as for the former town of Sanbu, but is pronounced differently. Sanmu was damaged by a tsunami as a result of the 2011 Tōhoku earthquake and tsunami, with 43 buildings destroyed and 438 buildings partially destroyed, but with only one fatality.
Sanmu has a mayor-council form of government with a directly elected mayor and a unicameral city council of 20 members. Sanmu contributes one member to the Chiba Prefectural Assembly. In terms of national politics, the city is part of Chiba 11th district of the lower house of the Diet of Japan.
Due to mixed plantings of Japanese red pine, Japanese cypress, and Japanese cedar, Sanmu was a center of wood production until 1923 at the end of the Taishō period. Many in the town remain active in the woodworking and carpentry trade. Small-scale agriculture in Sanmu produces a variety of fruits and vegetables, but the town is noted for carrots, watermelon, peanuts.[4] The town also attracts tourists to its numerous strawberry farms.[5] Sanmu serves as a bedroom community for nearby Chiba and Tokyo, and housing development continues in the city.[6]
Sanmu has 13 public elementary schools and six public middle schools operated by the city government, and two public high schools operated by the Chiba Prefectural Board of Education