Portillo is an Andean ski resort northeast of Santiago, Chile near the border crossing into Argentina. It is at 10,000 ft (3000 meters) and not far from Aconcagua which, at 22,841 feet (6962 meters), is the tallest mountain outside of Asia. In the evening of my brief overnight stay I experienced very unusual light as the sun dropped below the clouds and its light was filtered through the smoggy atmosphere of the coastal plain

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