We just returned from my Atacama and Patagonia Photo Tour 2018.  Driving into the Atacama Desert from Argentina, we crossed the Andes Mountains.  I was watching the altitude on the GPS we had in front of the bus.  The highest altitude was 4833 meters which equals 15856 feet.  More post will follow as I edit my images.  If you are interested in a future trip, please email me at info@phototours.us.  Thank you.