Isumi District, Chiba
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Isumi District 夷隅郡 |
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| District of Chiba Prefecture | |
| 夷隅郡• Isumi-gun | |
Isumi River in Ōtaki
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 Location of Isumi District in Chiba |
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 Isumi District
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| Coordinates: 35°13′52.2″N 140°14′1″E / 35.231167°N 140.23361°ECoordinates: 35°13′52.2″N 140°14′1″E / 35.231167°N 140.23361°E | |
| Country | Japan |
| Region | Kantō |
| Prefecture | Chiba |
| Area | |
| • Total | 154.76 km2 (59.75 sq mi) |
| Population (2010) | |
| • Total | 18,593 |
| • Density | 120/km2 (300/sq mi) |
| Time zone | Japan Standard Time (UTC+9) |
| Telephone | 0470-86-6600 |
| Address | 88-1 Yamasa, Isumi-shi, Chiba-ken 298-0124 |
| Website | Isumi County-City Joint Administration Block Office Association(Japanese) |
Isumi District (夷隅郡 Isumi-gun?) is a district located in Chiba, Japan. As of 2010, the district has an estimated population of 18,593 and a density of 120 persons per km². The total area was 154.76 square kilometres (59.75 sq mi). The district formerly included all of the city of Katsuura, most of the city of Isumi and a portion of the town of Mutsuzawa. It has been reduced in size through mergers and consolidation to two towns. The district is located in the outer zone of Metropolitan Tokyo, roughly 70 kilometres (43 mi) from the center of the capital.
Isumi District was one of the ancient districts of Kazusa Province. The district was named after the Isumi River, which runs from the mountainous areas of Katsuura to the south of Kujūkuri Beach on the Pacific Ocean. The district is mentioned in Nara-period chronicles under various names, usually as Ishimi (伊志美?). The Nihon Shoki records the area as Ijimi no Kuni (伊甚国?), and the Kojiki as Ijimu (伊自牟?). In the ancient period the district bordered Mōda and Unakami districts to the west, and Habu and Nagara districts to the north. In the Heian period (794–1185) the district was divided into two shōen estates; one to the north, and one to the south.Minamoto no Yoritomo (1147–1199) drew soldiers from both shōen estates with the assistance of the local warloard Kazusa Hirotsune (?–1184). Yoritomo went on to found the Kamakura Shogunate. Manki Castle and Ōtaki Castle were built in this period. Kuniyoshi, once a village and now part of Isumi City, became a noted market town in this period, and a rokusai-ichi, or market held six days of the month, is held to this day. By the end of the Sengoku period (1467–1573) the district had been variously controlled by the Toki, Hōjō, and Satomi clans. The Satomi ceded the area to Oda Nobunaga (1534–1582) in 1590.
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