Sanbu District (山武郡, Sanbu-gun) is a district located in Chiba Prefecture, Japan. As of January 2013, the district had a population of 49,488 and a population density of 369 persons per km. The total area is 134.1 square kilometres (51.8 sq mi).
Ōamishirasato, formerly a town in Sanbu District, was elevated to city status on January 1, 2013, and is no longer part of Sanbu District.
History
During the early Meiji period establishment of the municipality system on April 1, 1889, the districts of Yamabe District (山辺郡, Yamabe-gun) with 3 towns and 14 villages, and Musha District (武射郡, Musha-gun) with 1 towns and 14 villages were created in what was formerly the north-eastern portion of Kazusa Province. The two districts were formally merged into the new Sanbu District on April 1, 1897.
^"山武郡" [Sanbu District]. Nihon Rekishi Chimei Taikei (in Japanese). Tokyo: Shogakukan. 2012. OCLC173191044. dlc 2009238904. Archived from the original on 2007-08-25. Retrieved 2012-12-07.
^Ishii, Sōseki, ed. (May 2012). 平成25年１月１日 大網白里市誕生に向けて [Toward the formation of the city of Ōamishirasato on Jan. 1, 2013] (PDF). Hōkoku Ōamishirasato (in Japanese) (541). Ōamishirasato-machi, Chiba Prefecture, Japan: Ōamishirasato-machi, Hissho Kōhōka, Kōhō Tōkeihan: 2. Retrieved May 10, 2012.
^Yoshimura, Kenji (March 2, 2012). 大網白里町:名称「大網白里市」に来年１月 [Town of Ōamishirasato will be named "City of Ōamishirasato" in January 2013]. Mainichi Shinbun (in Japanese). Tokyo: Mainichi Newspapers. OCLC10684368. Archived from the original on 2012-07-10. Retrieved May 10, 2012.
^新市へ５８年の歴史に幕 大網白里町で閉町式 [After 58 Years, a New City: a Ceremony for the Closing of the Town of Ōamishirasato]. Chiba Nippo (in Japanese). Chiba, Chiba Prefecture, Japan: Chiba Nippo Co., Ltd. 2012-12-29. Retrieved 2012-12-31.
