I did a double crossing of the Grand Canyon, from the South Rim to the North Rim and back again. This is about 47 miles, but there are only two hills ;}
The double crossing took about 14 hours, with temperatures ranging from freezing to horribly hot, but outstandingly beautiful. Preparation is key to this run, as you are self supported. It is also important to choose the time of year carefully and plan to be able to run on one of several days. Bad weather can make this trip dangerous! The main danger is the heat, which can be intense, especially if it is unseasonably hot. The other issue is with water. There are several water opportunities on the run, but the pipes fail quite often. You need to be able to postpone the run a day or more to allow for repair time.
You should read the article on running the double crossing in the April 2008 edition of Ultrarunning magazine.
Looking back from close to the north rim. You can see the trail running along the canyon wall starting just by my right elbow. From here heading south, the path drops down to the bridge you can see near my right wrist, then climbs for a while before continuing its long decent to the Colorado River. The change in ascent/decent was very nice. By this time I could feel the effect of altitude, even though I had been at 6000 ft for more than a week and felt fine running at Bryce Canyon which is 8000-9000 feet.

Looking back from close to the north rim. You can see the trail running along the canyon wall starting just by my right elbow. From here heading south, the path drops down to the bridge you can see near my right wrist, then climbs for a while before continuing its long decent to the Colorado River. The change in ascent/decent was very nice. By this time I could feel the effect of altitude, even though I had been at 6000 ft for more than a week and felt fine running at Bryce Canyon which is 8000-9000 feet.
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