<sod>Difficult Run flows through [[Fairfax County, Virginia|Fairfax County]] to [[Great Falls Park]], on the Virginia side of the Potomac River.  The portion of the run through the park has been characterized as "a miniature [[Mather Gorge]] and [[Great Falls of the Potomac River|Great Falls]]."<ref>[http://www.nps.gov/archive/gwmp/grfa/trails/drt.htm The Difficult Run Trail, with NPS map of the run and the trail]</ref> The stream picks up speed as it narrows into a steep gorge with waterfalls and quickly reaches the same level as the Potomac. At the mouth of Difficult Run, one can see a panoramic view of the Potomac River.<eod>
<sod>Difficult Run flows through [[Fairfax County, Virginia|Fairfax County]] to [[Great Falls Park]], on the Virginia side of the Potomac River.  The portion of the run through the park has been characterized as "a miniature [[Mather Gorge]] and [[Great Falls of the Potomac River|Great Falls]]."<ref>[http://www.nps.gov/archive/gwmp/grfa/trails/drt.htm The Difficult Run Trail, with NPS map of the run and the trail]</ref> The stream picks up speed as it narrows into a steep gorge with waterfalls and quickly reaches the same level as the Potomac. At the mouth of Difficult Run, one can see a panoramic view of the Potomac River. <eod>