Grand Canyon R2R2R-alt (AZ)
The "Rim-to-Rim-to-Rim" (R2R2R) is a world-class route, staring on the South Rim of the Grand Canyon, running 5,000′ down to the Colorado River, across a bridge, then 6,000” up to the North Rim. Then back again. Records have been known for decades for doing this on the South and North Kaibab Trails, crossing the river on the bridge near Phantom Ranch. These are recorded here.