If McCandless had possessed a U.S. Geological Survey topographic map, it would have alerted him to the existence of a Park Service cabin on the upper Sushana River, six miles due south of the bus, a distance he might have been able to cover even in his severely weakened state. The cabin, just inside the boundary of Denali National Park, had been stocked with a small amount of emergency food, bedding, and first-aid supplies for the use of backcountry rangers on their winter patrols.
