Starting at the NYRC store at Columbus Circle, this loop runs through Central Park and around its scenic reservoir.
The loop is 4.5 miles, and has a few rolling hills. The path around the Reservoir is gravel. This run has a total ascent of 160 ft. and a maximum elevation of 1903 ft, and ends back in Columbus Circle.
To watch a fly-over of the course, download the Google Earth plugin if prompted. You can also view this