Four Mile Run is a 9.4-mile-long (15.1 km)[1] stream in northern Virginia that starts near Interstate 66, at Gordon Avenue in Fairfax County and proceeds southeast through Falls Church to Arlington County in the U.S. state ofVirginia. Most of the stretch is parkland and is paralleled by two paved non-motorized transport and recreational trails, the Washington & Old Dominion Railroad Trail and the Four Mile Run Trail.
