from start/finish north out and back 4.2 miles, then south out 8 miles and back 8 miles, then running the 4.2 mile north out-and-back again, and finally running south to a turnaround point about 3.6 miles south of the start/finish, for a 7.2-mile final section. total mileage should be approximately 31.6 miles. 100k will run this course twice to reach a total of 63+ miles. 