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 - "Rim to Rim to Rim". I first ran it sometime in the 80's, and it was quite the thing back then, but in the last few years this route has…
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