Mt. Vernon Trail according to National Park Service

-  4 miles out - cross over 2nd pedestrian bridge at National Airport

-  5 miles out - End of National Airport, after you cross the Four Mile Run stream.

- 5.5 miles out - Sailing Marina (mile marker 12)

  **  There is a "Y" intersection on the trail around here; bear left towards water.

- 6.5 miles out - mile marker 11

- 7 miles out - water fountain just at beginning of Old Town Alexandria on right, near railroad tracks

- 7.5 miles out - Continue into Old Town, get on Royal Street and run to Queen St.

-  8 miles out - Continue down Royal and run to Wilkes.

-  8.5 miles out - Continue down Royal until it ends at Jones Point Road.  Turn right then left where it is possible to cross under the Beltway.