Chōsei District

[1][2] Chōsei District occupies an area of central Chiba Prefecture to the east of the Bōsō Peninsula.

[1][2] 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.

[3] 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.

Mobara was elevated to city status on April 1, 1952, and ceased to be part of Chōsei District.

The mountainous areas of Nagara, Chonan, and Mutsuzawa were once major agricultural centers, but the district's proximity to the Keiyō Industrial Zone has transformed agricultural areas into centers of small-scale industry and housing complexes.