Ojin-tenno-ryo Kofun [33-1] is a keyhole-shaped mounded tomb located in the central part of the Furuichi area. The mound is the second largest in Japan.
The mound length is 425 m, and the height of the round rear part is 36 m. this tomb has the greatest mound volume in Japan.
The mound is surrounded by a double moat and bank, though the outer moat is preserved underground.
Both cylindrical and representational haniwa (earthenware funerary sculptures) have been unearthed from the mound and the moat. It is estimated that more than 20,000 cylindrical haniwa were arranged on it.
The construction period dates to the first half of the 5th century.