The Four Passes Loop (nicer name: "Ring of Bells"), is considered one of the best long trail runs in North America. Starting at 9,600' at the postcard-perfect Maroon Lake above Aspen, this loop is almost exactly Marathon distance, and transects the Maroon Bells/Snowmass Wilderness Area while going over four big passes, each over 12,400'. The scenery is amazing. There are no signs of civilization; only…
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