Description : The Portsmouth Earthworks are a large prehistoric mound complex constructed by the Ohio Hopewell culture mound builder indigenous peoples of eastern North America (100 BCE to 500 CE). The site was one of the largest earthwork ceremonial centers constructed by the Hopewell and is located at the confluence of the Scioto and Ohio Rivers, in present-day Ohio. The majority of the mound complex site is now covered by the city of Portsmouth in Scioto County, Ohio. Several individual sections of the complex have been included on the National Register of Historic Places.
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