November 25, 2014 jfk-map The JFK 50 starts in Boonsboro and heads 15.5 miles south along the Appalachian Trail. It then follows the Potomac River for 26.3 miles, and then roads inland to Williamsport for the final 8.4 miles. DSC_4097-ZF-3814-39450-1-001-001-editSM DSC_5214-ZF-3814-39450-1-001-008-editSM