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Greenstone Ridge Trail is a hiking trail in Keweenaw County, Michigan. It is within Isle Royale National Park. It is 39.3 miles long and begins at 1,103 feet altitude. Traveling the entire trail is 78.9 miles with a total elevation gain of 10,247 feet. Mount Desor (elevation 1,371 feet), Sugar Mountain (elevation 1,329 feet), and Mount Franklin (elevation 938 feet) can be seen along the trail. There are also wetlands along the trail.
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