Chōsei District, Chiba

Chōsei District (長生郡, Chōsei-gun^?) is a district located in Chiba Prefecture, Japan. As of September 2010, the district has an estimated population of 63,382 and a density of 279 persons per km². The total area was 226.97 square kilometres (87.63 sq mi). The district formerly included all of the city of Mobara and a small portion of the city of Isumi.

Chōsei District occupies an area of central Chiba Prefecture to the east of the Bōsō Peninsula. The west of the district ranges from the Bōsō Hill Range to the Kujūkuri Plain; the east of the district runs along the broad coast of the Kujūkuri Beach on the Pacific Ocean. The Ichinomiya River (37.3 kilometres (23.2 mi)) emerges from the Bōsō Hill Range in Chōnan and empties into the Pacific Ocean at Kujukuri Beach in Chōsei.

During the Edo period, almost all of the area present-day Chōsei District was tenryō territory under direct control of the central government and administered by various hatamoto, with the exception of Ichinomiya, most of which was under the rule of Ichinomiya Domain, a minor feudal domain of the Tokugawa shogunate ruled by the Kano clan.

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