Salt flats, Bolivian cycling classic.
The smaller Salar de Coipasa to the north, ride off soft sand corrugations and all of a sudden the ground becomes flat, reflecting white everywhere, hard but the topmost layer away from the “highways” crunches as wheels turn over it. This southwest corner of Bolivia, nearby in Chile too, is full of salty ground. The Altiplano region is surrounded by mountains, and what little moisture there is has no way to drain away, instead evaporating and leaving behind salt. In such an environment, moisturizer (uses: human skin, and rubber o-rings on mechanical equipment) is a great thing to carry.