The Ōyu Stone Circles, located in Kazuno, Akita Prefecture, Japan, are a significant archaeological site comprising two large stone circles, the Manza and Nonakado circles. Dating back to the Jōmon period (approximately 2,300–1,500 BCE), these structures are thought to have been used for ceremonial or communal purposes. The site features intricately arranged stones and suggests advanced knowledge of construction and astronomy among the Jōmon people.
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