Potomac River Run Marathon (October)

The Potomac River Run Marathon in October follows an entirely flat, out-and-back course on an unpaved, 12-foot-wide trail adjacent to the Potomac River. Runners travel through a historic landscape marked by 150-year-old canal locks, stone gatehouses, and sections of the Chesapeake & Ohio Canal National Historical Park. The surface consists of packed gravel, with less than 100 meters of deviation onto a wooden footbridge, keeping the majority of the run on a consistent trail.\n\nOne of the main c