The challenging Forest of Nisene Marks Marathon course is an out and back on a fire road under a canopy of trees with an elevation gain of 2500 feet in the first 12 miles. There are two steep climbs on the course at miles 5 to 6 and 10 to ll.
See what splits you need to run for hundreds of different marathons - adjusted for the specific terrain of each marathon, your goal time and pacing strategies.