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Kawachi Bay (河内湾) was a bay that existed millennia ago in modern
Osaka is a designated city in the Kansai region of Honshu in Japan. It is the capital of and most populous city in Osaka Prefecture, and the third most populous city in Japan, following Special wards of Tokyo and Yokohama. With a population of ...
city and surrounds. On its eastern border were the Ikoma mountain range, and the west there was a peninsula where many (pre)historical settlements are found. Both the
Yodo River The , also called the Seta River (瀬田川 ''Seta-gawa'') and the Uji River (宇治川 ''Uji-gawa'') at portions of its route, is the principal river in Osaka Prefecture on Honshu, Japan. The source of the river is Lake Biwa in Shiga Prefectur ...
on the northern periphery and the
Yamato River The is a river which flows through Nara Prefecture and Osaka Prefecture, Japan. It is designated Class A by the Ministry of Land, Infrastructure, Transport and Tourism (MLIT). The river flows via towns: *Nara Prefecture ** Yamatokōriyama *Os ...
on the southern end emptied into it. The alluvium deposits created a sandbar today known as Uemachi Plateau. Eventually the bay was cut off from the ocean by the growing sand peninsula, turning it into a lake called Kawachi Lake (河内湖). Continual deposition in time filled the lake turning it swampy; some centuries later it became an alluvial plain on which most of
Osaka Prefecture is a prefecture of Japan located in the Kansai region of Honshu. Osaka Prefecture has a population of 8,778,035 () and has a geographic area of . Osaka Prefecture borders Hyōgo Prefecture to the northwest, Kyoto Prefecture to the north, Nar ...
sits. The word ''Kawachi'' refers to
Kawachi Province was a province of Japan in the eastern part of modern Osaka Prefecture. It originally held the southwestern area that was split off into Izumi Province. It was also known as . Geography The area was radically different in the past, with Kawac ...
, which itself means ''inside the river''.


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Kawachi bay rendering (japanese)

City gov produced history book cover showing map of Kawachi Lake (japanese)
Landforms of Osaka Prefecture {{Osaka-geo-stub