The SD 100 mile course starts and finishes at the Al Bahr Campground which is off of Sunrise Highway within the Camp Laguna Recreational Area.  The course covers four main areas. The first 16.5 miles are located in the Recreational Area; from there, runners transition to the Pacific Crest Trail (PCT) for ten miles before descending the Noble Canyon Trail towards Pine Valley. From Pine Valley, runners climb back up to the PCT and run north for another 11 miles (on the PCT again) to Sunrise Aid Station. Runners then descend to the west and enter a 30 mile section in the Cuyamacas. After completing the Cuyamaca section, the course returns to the PCT, Camp Laguna Mountain Recreational area, and the finish line at Al Bahr.

The course includes an incredible variety of trails and vistas with minimal out and back tracks. Please take time to study the below maps and aid station locations/times. The course will be well marked but there is always the possibility of vandalism of markers.