The North Face: 50 mile, 50k, marathon, half marathon ...
This one takes place in Pine Mountain, GA, near Callaway Gardens. Many distances to choose from - longer races are on Saturday, shorter races are on Sunday. Suggesting this now because it's time to start training for the longer ones. I'm doing the marathon -- it will be my first trail marathon (and first marathon in 13 years)!
See the site for detailed info: