In just over 6km, we climbed from 4018m to 4450m, at the base of Thorong La canyon. Along the way, we questioned if what we felt were the first problems of Altitude Evil. It was never more than a false alarm.
This section of the Annapurna Circuit is only 1km away, but in less than two hours it takes you from 4450m to 4850m and to the entrance to the great canyon. Sleeping in High Camp is a test of resistance to Mountain Evil that not everyone passes.