Serpent Mound crater, also known as the Serpent Mound Disturbance, is an eroded meteorite impact crater in Ohio, United States. It lies largely in Adams County, with the northern part mostly in Highland County, except for a small northeast part in Pike County. The crater is named after the Serpent Mound, an effigy mound, located on a plateau in Brush Creek Valley within the crater. European-American explorers had already noted the unusual terrain in the 19th century, and it is often speculated that the odd geological features inspired Native Americans to construct the mound at that location.