The Newark Earthworks in Newark and Heath, Ohio, consist of three sections of preserved earthworks: the Great Circle Earthworks, the Octagon Earthworks, and the Wright Earthworks. This complex, built by the Hopewell culture between 100 BCE and 400 CE, contains the largest earthen enclosures in the world, and was about 3,000 acres in total extent. Less than 10 percent of the total site has been preserved since European-American settlement; this area contains a total of 206 acres (83 ha). Newark's Octagon and Great Circle Earthworks are managed by the Ohio History Connection. A designated National Historic Landmark, in 2006 the Newark Earthworks was also designated as the "official prehistoric monument of the State of Ohio."

Newark is a city in, and the county seat of, Licking County, Ohio, United States; it is located 40 miles (64 km) east of Columbus at the junction of the forks of the Licking River. The population was 49,934 at the 2020 census, making it the 18th-largest city in Ohio. It is most known for having the world's largest basket, former headquarters of the now defunct Longaberger Company. The city is part of the Columbus metropolitan area.