The Leesburg 20k course is used in 1 event in 2018:

Sept 23 – Semper Fi Leesburg 5k, 10k, 20k & Kids 1-Miler

This course winds through the paved bike path of the Washington & Old Dominion trail.

The course has been USATF approved for a 10k distance. The 20k is two laps of the 10k course.

To see this map in a browser, click here.

Think you could dominate this course and set the fastest time?  See below for the course records and which races they were set in…