Lower Shawneetown, also known as Shannoah or Sonnontio, was an 18th-century Shawnee village located within the Lower Shawneetown Archeological District, near South Portsmouth in Greenup County, Kentucky and Lewis County, Kentucky. The population eventually occupied areas on both sides of the Ohio River, and along both sides of the Scioto River in what is now Scioto County, Ohio. It was added to the National Register of Historic Places on 28 April 1983. It is near the Bentley site, a Madisonville Horizon settlement inhabited between 1400 CE and 1625 CE. Nearby, to the east, there are also four groups of Hopewell tradition mounds, built between 100 BCE and 500 CE, known as the Portsmouth Earthworks.

The Ohio River is a 981-mile-long (1,579 km) river in the United States. It is located at the boundary of the Midwestern and Southern United States, flowing in a southwesterly direction from western Pennsylvania to its mouth on the Mississippi River at the southern tip of Illinois. It is the third largest river by discharge volume in the United States and the largest tributary by volume of the north-south flowing Mississippi River, which divides the eastern from western United States. It is also the 6th oldest river on the North American continent. The river flows through or along the border of six states, and its drainage basin includes parts of 14 states. Through its largest tributary, the Tennessee River, the basin includes several states of the southeastern U.S. It is the source of drinking water for five million people.