Caroline County is a United States county located in the eastern part of the Commonwealth of Virginia. The northern boundary of the county borders on the Rappahannock River, notably at the historic town of Port Royal. The Caroline county seat is Bowling Green.

The Rappahannock River is a river in eastern Virginia, in the United States, approximately 195 miles (314 km) in length. It traverses the entire northern part of the state, from the Blue Ridge Mountains in the west where it rises, across the Piedmont to the Fall Line, and onward through the coastal plain to flow into the Chesapeake Bay, south of the Potomac River.