The Ohyasaba Kofun Group, located in Koriyama City, Fukushima Prefecture, is estimated to date from the latter half of the early Kofun period.
The group consists of one *zenpo-koho-fun* (keyhole-shaped tomb with a rectangular rear section) and four circular burial mounds.
Tomb No. 1 is the largest *zenpo-koho-fun* in the Tohoku region; it has been designated a National Historic Site, and the surrounding area has been developed into the Oyasaba Historic Site Park.



