Sanmaizuka Tumulus-The area is a rural park with ancient Imperial graves with a mound length of 82.1m: March 1955, reclamation dam construction, earth and sand collection work for embankment-Nagamochi-gata (chest-shaped) stone coffin: A box-shaped sarcophagus that combines a bottom stone, four side stones, and a cover stone. Production started around the end of the 4th century

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