The Great Serpent Mound is a 1,330-foot-long, three-foot-high prehistoric effigy mound located on a plateau of the Serpent Mound crater along Ohio Brush Creek in Adams County, Ohio
View page
The Adena people built the Serpent Mound in present-day Ohio, USA. The mound is an ancient effigy mound representing a serpent and is one of the largest earthwork effigies in the world.