The Abra del Acay in La Poma Department, Salta Province, Argentina is the highest point in Argentina's National Route 40. Located at 24°23′S 66°14′W, its altitude is 4,972 meters , even though an old sign informs visitors it stands at 4,895 meters . The Abra del Acay is approximately 25 kilometers geodesic distance southeast from San Antonio de los Cobres, although the direct route by road is about 45 kilometers . Inaugurated on 8 July 1960 after three years of construction, this unpaved part of the National Route 40 is only suitable for all-terrain vehicles, with the exception of some months in the year when meteorological and maintenance conditions allow normal vehicles to transit. The road inclination of 4.5% and oxygen deprivation due to altitude make the crossing difficult for both vehicles and people.
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