District of Columbia - Maryland. Nice late Sunday afternoon run between the Potomac and the canal. I got plenty of extra mileage, as the border wasn't marked, & I ran a few miles past it before realizing that and turning around. However, thanks to the omnipresent Google Maps turbocharged with satellite view, I later settled on where to draw the line.
#CARPe Crazy Ass Running Plan
Fear the State Line - Fear the Turtle is a reference to the University of Maryland's sports mascot.