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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.
Although the average distance across the canyon is only 10 miles (16 km), it is a five-hour drive of about 215 miles (346 km) between the park's South Rim Village and the North Rim Village. For those with time on their hands there is an option to hike from one rim to the other.