The dirt racecourse, known officially as the "Main Track" and nicknamed "Big Sandy" by racing followers, has a circumference of , the longest dirt thoroughbred racetrack in North America. Immediately inside of this is the "Widener Turf Course" (named after the Widener family that has a long and prestigious history in American horse racing) spanning plus , which in turn encircles an "Inner Turf Course" with a circumference of plus . On the Main Track, it is from the top of the stretch to the finish line, and the segment between the wire and the start of the first (clubhouse) turn covers ; this latter segment is shorter by approximately on both of the turf courses, in order to accommodate the two chutes that exist on the Widener Turf Course, from which turf races of and are started; an additional chute exists for races of on the Inner Turf Course.