Kasaoka (笠岡市, Kasaoka-shi) is a city located in Okayama Prefecture, Japan. As of 1 March 2023, the city had an estimated population of 45,404 in 21,987 households and a population density of 330 persons per km². The total area of the city is 136.24 square kilometres (52.60 sq mi). The municipal district also includes 31 outlying islands including seven inhabited islands in the Kasaoka Islands archipelago in the Seto Inland Sea. Kasaoka is in the far southwestern corner of Okayama Prefecture, bordered by the Seto Inland Sea to the south and Hiroshima Prefecture to the west. It is mostly hilly and mountainous in the north, and consists of flat reclaimed land in the south. Urbanization is very diffuse, with the main urban concentration at the former port town of Kasaoka, with numerous hamlets scattered widely in narrow valley-shaped plains mostly in the central and northern areas. The tidal flats in the south are noted for endangered horseshoe crabs and the sea area between Kōnoshima and Nishi-Oshima has been designated as a national Natural Monument. More information...
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