is a city located in Niigata Prefecture, Japan. , the city had an estimated population of 95,706 in 36,201 households, and a population density of 222 persons per kmò. The total area of the city was .
Sanjà  is located in an inland region of north-central Niigata Prefecture. It is about 2 hours from Tokyo via the Jà Âetsu Shinkansen or 4 hours on the Kan-Etsu Expressway and Hokuriku Expressway. The Shinano River flows through the west of it from south to north and the Ikarashi-gawa River flows through the centre of the urbanised area.
Sanjà  has a Humid climate (Köppen Cfa) characterized by warm, wet summers and cold winters with heavy snowfall. The average annual temperature in Sanjà  is . The average annual rainfall is with September as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around .
Per Japanese census data, the population of Sanjà  peaked at around 1985 and has declined steadily since.
The area of present-day Sanjà  was part of ancient Echigo Province. During the Edo period, the area was part of Sanjà  Domain, a feudal domain under the Tokugawa shogunate from 1598 to 1651. Afterwards, it was divided between Nagaoka Domain, Murakami Domain and tenryà  territory administered directly by the shogunate. After the start of the Meiji period, the area was organised as part of Minamikanbara District, Niigata. The town of Sanjà  was created with the establishment of the modern municipalities system on April 1, 1889. It was raised to city status on January 1, 1934. Heavy rain caused extensive flooding in 1961 and in 2004. On May 1, 2005, the town of Sakae, and the village of Shitada (both from Minamikanbara District) were merged into Sanjà Â.
Sanjà  has a mayor-council form of government with a directly elected mayor and a unicameral city legislature of 22 members. On November 8, 2020, attorney was elected to become the next mayor of Sanjà Â.
Sanjà  is traditionally known for its iron crafts, notably knives and scissors. The following are headquartered in Sanjà Â.
It is also one of the municipalities where a local Factory Festival takes place once per year in October (Kouba no Saiten).
Sanjà  has 25 public elementary schools and nine public middle schools operated by the city government. There are four public high schools operated by the Niigata Prefectural Board of Education, and the prefecture also operates one special education school.
JR East - JÃ Âetsu Shinkansen