Seishan tomb

Tsukuriyama Kofun (作山古墳) is a Kofun period burial mound located in the Misu neighborhood of Sōja, Okayama Prefecture, in the San'yō region of Japan. The tumulus was designated a National Historic Site of Japan in 1921. It is the second largest tumulus in Okayama Prefecture and the tenth largest in Japan, and is estimated to have been built in the middle of the 5th century (in the middle of the Kofun period).

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• history