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Depending on how you link up the trails, the rim-to-rim (R2R) hike is about 24 miles (38 kilometers). The R2R hike is divided roughly into three parts. On each end is the steep hike out of the canyon and the middle third is a more moderate and smoother hike through a side canyon that is spectacular in it's own right.
The trail follows the White Rim, a water-eroded shelf of light-colored sandstone, for most of the 100 miles. At about mile 66 you'll find the Fort Bottom Hiking Trail. This two-hour (round-trip) hike will take you to a lookout point with an Indian Ruin. After visiting the ruin, continue clockwise on the Rim.