The Appalachian Trail's scale is almost incomprehensible to casual hikers

Bryson repeatedly returns to the sheer physical scale of the Appalachian Trail, which stretches roughly 2,100 miles through fourteen states from Georgia to Maine, climbing and descending an accumulated elevation gain over the entire route that Bryson notes is comparable to climbing Mount Everest multiple times over. He uses this scale to puncture the casual assumption, including his own initial one, that a long-distance hike is essentially an extended, pleasant countryside walk; in reality it demands weeks of sustained physical effort through difficult terrain, unpredictable weather, and long stretches without resupply. Very few people who start the full trail in a single continuous attempt (called a thru-hike) actually complete it in one season, and Bryson treats this attrition rate as evidence of how badly most people—including experienced outdoor enthusiasts—underestimate what the trail actually demands physically and psychologically. His own journey, covering only a fraction of the full trail, becomes a way of respecting that scale honestly rather than pretending casual effort suffices. Takeaway: the Appalachian Trail's enormous scale routinely defeats even well-intentioned, reasonably fit hikers who underestimate it.