Sai District, Gunma
Sai District was formerly a rural district located in Gunma Prefecture, Japan. The district is now entirely part of the city of Isesaki.
Sai District was created on December 7, 1878 with the reorganization of Gunma Prefecture into districts. It included 2 towns and 13 villages, which were formerly part of the holdings of Isezaki Domain, 3 villages which belonged to Ichinomiya Domain in Kazusa Province, 1 village which belonged to Maebashi Domain and 20 villages which were part of the tenryō holdings in Kōzuke Province under the direct control of the Tokugawa shogunate. With the establishment of the municipalities system on April 1, 1889 the area was organized as a two towns and eight villages.
On April 1, 1896, the district was merged with Nawa District to form Sawa District
