Question: Which county shares a border with the county where the most populous city in the state where Washington State Prison can be found is located?

Knowledge 1: Washington State Prison
Washington State Prison is located in Davisboro in Washington County, Georgia. It is a facility for a maximum of 1548 adult male inmates at minimum and medium security. It is a part of the Georgia Department of Corrections. [SEP] Knowledge 2: List of municipalities in Georgia (U.S. state)
The largest municipality by population in Georgia is Atlanta with 420,003 residents, and the smallest municipality by population is Edge Hill with 24 residents. The largest municipality by land area is Augusta, a consolidated city - county, which spans 302.47 sq mi (783.4 km), while Edge Hill and Santa Claus are tied for the smallest at 0.18 sq mi (0.47 km) each. [SEP] Knowledge 3: Sno*Drift
Sno*Drift is a rally racing event held in Montmorency County, Michigan, annually, with headquarters in Atlanta, Michigan. The event is currently the first Rally America National Rally Championship event of the season. Currently the event is organized into three distinct rallies: the national championship event covering both days of rallying, and two regional rally events each covering one of the two days. Competitors may be entered in any or all of these events simultaneously. [SEP] Knowledge 4: Alpena Power Company
Alpena Power Company is a public utility company that provides electricity to most of Alpena County, Michigan, as well as southeastern Presque Isle County and the village of Hillman, in Montmorency County. The headquarters are located in Alpena, Michigan. The company was founded in 1881 by George N. Fletcher.
Knowledge 1: Washington State Prison
Washington State Prison is located in Davisboro in Washington County, Georgia. It is a facility for a maximum of 1548 adult male inmates at minimum and medium security. It is a part of the Georgia Department of Corrections. [SEP] Knowledge 2: List of municipalities in Georgia (U.S. state)
The largest municipality by population in Georgia is Atlanta with 420,003 residents, and the smallest municipality by population is Edge Hill with 24 residents. The largest municipality by land area is Augusta, a consolidated city - county, which spans 302.47 sq mi (783.4 km), while Edge Hill and Santa Claus are tied for the smallest at 0.18 sq mi (0.47 km) each. [SEP] Knowledge 3: Sno*Drift
Sno*Drift is a rally racing event held in Montmorency County, Michigan, annually, with headquarters in Atlanta, Michigan. The event is currently the first Rally America National Rally Championship event of the season. Currently the event is organized into three distinct rallies: the national championship event covering both days of rallying, and two regional rally events each covering one of the two days. Competitors may be entered in any or all of these events simultaneously. [SEP] Knowledge 4: Warren, Vermont
Warren is a town in Washington County, Vermont, United States. The population was 1,705 at the 2010 census. The center of population of Vermont is located in Warren. It is set between the two ranges of the Green Mountains, with approximately 25% of the town under Green Mountain National Forest ownership. Sugarbush Resort located here is a ski resort, and the town is traversed by the Long Trail, a hiking trail running from the border with Massachusetts to the Canada–US border.
Knowledge 1: Washington State Prison
Washington State Prison is located in Davisboro in Washington County, Georgia. It is a facility for a maximum of 1548 adult male inmates at minimum and medium security. It is a part of the Georgia Department of Corrections. [SEP] Knowledge 2: List of municipalities in Georgia (U.S. state)
The largest municipality by population in Georgia is Atlanta with 420,003 residents, and the smallest municipality by population is Edge Hill with 24 residents. The largest municipality by land area is Augusta, a consolidated city - county, which spans 302.47 sq mi (783.4 km), while Edge Hill and Santa Claus are tied for the smallest at 0.18 sq mi (0.47 km) each. [SEP] Knowledge 3: Warren, Vermont
Warren is a town in Washington County, Vermont, United States. The population was 1,705 at the 2010 census. The center of population of Vermont is located in Warren. It is set between the two ranges of the Green Mountains, with approximately 25% of the town under Green Mountain National Forest ownership. Sugarbush Resort located here is a ski resort, and the town is traversed by the Long Trail, a hiking trail running from the border with Massachusetts to the Canada–US border. [SEP] Knowledge 4: Tennessee
Tennessee (i/tɛnᵻˈsiː/) (Cherokee: ᏔᎾᏏ, Tanasi) is a state located in the southeastern United States. Tennessee is the 36th largest and the 17th most populous of the 50 United States. Tennessee is bordered by Kentucky and Virginia to the north, North Carolina to the east, Georgia, Alabama, and Mississippi to the south, and Arkansas and Missouri to the west. The Appalachian Mountains dominate the eastern part of the state, and the Mississippi River forms the state's western border. Tennessee's capital and second largest city is Nashville, which has a population of 601,222. Memphis is the state's largest city, with a population of 653,450.

Answer: Presque Isle County