From Ohio History Central
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The Highbanks Park Earthworks consist of a C-shaped embankment that encloses a tall bluff overlooking the Olentangy River in Delaware County, Ohio. The earthen walls are about 3 feet high and are broken by three openings, or gateways. There is a ditch on the exterior of the wall that originally was 3 feet deep, indicating the ditch was the source of the earth that formed the wall. This embankment and ditch may have served as a defensive wall for a Late Woodland (600 A.D. to 1200 A.D.) or Late Prehistoric (900 A.D. to 1650 A.D.) village of prehistoric Native American people.
The Highbanks Earthworks occasionally are confused with High Bank Earthworks of the Hopewell people in Ross County, Ohio.