Yamamae Ruins spreading on the south slopes of the terraced land located between the Naruse River and the Eai River in Misato Town, Miyagi Prefecture, are the complex of the colony ruins built from the early to mid-Jomon period and from the Kofun to Heian periods. The ruins site is nationally designated as a Historic Site.

From the Jomon ruins, pit dwellings and shell mounds were found. The colony of the Kofun period and the large moat surrounding the colony were also found. Wooden fork heads, wooden blocks for beating cloth, thrusting sticks, bamboo baskets were excavated from the moat. Other ruins of colonies and relics in the Nara through Heian periods were also excavated. It is considered to be an academically important historic site, which had been used for thousands of years.

The ruins site has been converted into a history park and is open to the public.