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National Geographic: Appalachian Trail

Stretching approximately 2,175 miles, the Appalachian Trail is the longest marked trail in the country, hiked in part by some 4 million people each year. National Geographic straps on the boots to explore the splendors of this celebrated route. Marked by challenging climbs, sweeping vistas and dense forests, the mountainous trail is kept healthy and wild thanks to the efforts of countless conservationists, volunteers and scientists.