I noticed that the course consists of one 2km loop so the 12km runners will do it 6 times. I am not familiar with the course, but it appears there is a hill a little before the half-way point of the loop. I'm sure there are many people familiar with the course who can shed some insight into the difficulty of the course.
http://www.nyrr.org/xc/Van_Cortlandt_Park.pdf
http://www.nyrr.org/xc/Van_Cortlandt_Park.pdf
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