The Twin Mounds Site, also known as the Nolan Site, is a Mississippian culture archaeological site located near Barlow in Ballard County, Kentucky, just north of the confluence of the Ohio and Mississippi Rivers, and directly across the Ohio River from Mound City, Illinois.

Mound City is a city and the county seat of Pulaski County, Illinois, United States. It is located along the Ohio River just north of its confluence with the Mississippi River. As of the 2010 census, the city population was 588.