Directions to the 100K Start (Georgetown, DC)
The trailhead for the 100K is the parking lot of Thompson Boat Center at 2900 Virginia Ave, NW, Washington, DC (intersection with Rock Creek Parkway), across the parkway from the Watergate.
Thompson's Boat Center is marked on any good map of Washington, DC, and driving directions can also be obtained on the Internet using the address above. Parking at Thompson Boat Center is metered so you cannot leave a vehicle there.
See the Getting to the 100K Trailhead section for more information.