Appalachian Trail 2004
I also thru-hiked the Appalachian Trail, from Georgia to Maine. You can read my journal from that hike, and look at the photos I took.
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The PCT
The Pacific Crest National Scenic Trail (PCT) runs 2,663 miles from the California-Mexico border to the Washington-Canada border. The trail covers some of the most diverse terrain, from waterless stretches of desert to snow-covered high mountain passes.
In order to thru-hike the PCT, one must wait long enough in the spring for the snow in the Sierras to begin to melt, but not so long that the mountains in northern Washington will be unpassable because of autumn snow. The entire journey takes approximately five months to complete.
Obviously, one can't carry enough food for all of that time at once! Like with any long trail, supplies are obtained along the way by going into towns along the trail and purchasing food from stores. If a particular town doesn't have a store big enough, one will have to have planned ahead and mailed food to oneself.