is a rural district located in Gunma Prefecture, Japan. As of January 2015, the district had an estimated population of 3,272 and an area of 296.45 km2, with a population density of 11 people per square kilometer. Towns and villages Kanna Ueno Parts of the city of Takasaki and all of the city of Fujioka were formerly part of the district. History Tano District was created on April 1, 1896 by the merger of the former districts of Minamikanra, Tago and Midono. At the time of its creation, the district had four towns (Yoshii, Fujioka, Onishi and Shin) and 14 villages. 1926, April 1 – Kamikawa village was raised to town status; renamed Mamba Town 1954, April 1 – Fujioka annexed Kanna, Ono, Midori and Mikuri villages and was elevated to city status 1954, October 1 – Onishi annexed neighboring Mihara, and Sanbagawa villages 1955, January 1 – Yoshii annexed Tago, Irino villages and Iwadaira village from Kanra District 1955, March 1 – Fujioka annexed Hirai, Hino villages 1956, September 30 – Yawata village was annexed by Takasaki City 2003, April 1 – Manba town and Nakasato village merged, forming Kanna Town 2006, January 1 – Onishi town was annexed by Fujioka City 2006, January 23 – Shin Town was annexed by Takasaki City 2009, June 1 – Yoshii Town was annexed by Takasaki City Districts in Gunma Prefecture