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The Greenstone (named for the colored mineral-bearing "gemstone" embedded in the rock various places on the island) runs nearly the full length of the island, along its spine. Its western end is at the Windigo ranger station and its eastern end is across Tobin Harbor from the station at Snug Harbor. (Most hikers go around Tobin Harbor to join the Greenstone at Mount Franklin.) It ranges from easy to moderately difficult hiking for 5-6 days, and is easy to follow.