Sanbu District
district in Chiba prefecture, Japan
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 km2. The total area is 134.1 square kilometres (51.8 mi2).
Towns and villages
Kujūkuri
Shibayama
Yokoshibahikari
Elevation of Ōamishirasato to city status
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.
Mergers
On March 27, 2006, the towns of Sanbu, Naruto, Hasunuma and Matsuo merged to form the new city of Sanmu.
On March 27, 2006, the town of Yokoshiba merged with Hikari from Sōsa District to form the new town of Yokoshibahikari in Sanbu District.
The public source identifies “Sanbu District” as district in Chiba prefecture, Japan. This brief keeps that definition visible, then builds a research path around Sanbu, District and district.
Why this record matters
A short description can identify a subject without explaining its stakes. For “Sanbu District”, the useful work is to connect “district in Chiba prefecture, Japan” to the records capable of establishing context and consequence.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Sep 17, 2026. The linked authority identifier is Q1153740. VIAF identifies the subject as 257267619. Authority coordinates are 35.638, 140.514. 2 of 3 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 2013, 1889, 1897 and 2006.
A single description cannot reconcile every naming convention, rebuilding phase or administrative transfer associated with a place. The source lead contains qualifying language; that uncertainty should survive quotation, summary and reuse. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “Sanbu District”, its source revision and the description used here.
- Expand the search: follow Sanbu District primary sources, Sanbu District archive and Sanbu research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Sanbu District”?
- Which authority defined the place, boundary or structure at the relevant date?
- Which earlier names or jurisdictions may reveal additional records?
Search terms from this dossier
This entry incorporates text from “Sanbu District” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.