is a rural district located in Gunma Prefecture, Japan. As of January 2015, the district had an estimated population of 36,952 and an area of 25.78 km2, with a population density of 1430 people per square kilometer. Towns and villages Tamamura All of the city of Isesaki and part of the city of Maebashi were formerly part of the district. History Sawa District was created on April 1, 1896 by the merger of Sai District and Nawa District. At the time of its creation, it was organized into three towns (Isesaki, Sakai and Tamamura) and 13 villages. 1940, September 13 – Uehasu and Moro villages annexed by Isesaki, which was raised to city status 1955, January 10 – Isesaki annexed Misato village 1955, March 1 – Sakai annexed Uneme, Gōshi and Shima villages 1955, March 25 – Isesaki annexed Nawa, Toyouke and Miyagō villages 1955, April 20 – Tamamura annexed Shibane village 1957, August 1 - Sakai annexed the villages of Jōyō 1986, October 1 – Akabori village was raised to town status 2005, January 1 – Akabori, Sakai towns and Azuma village are annexed by Isesaki. Districts in Gunma Prefecture