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La maggiore montagna dell'America settentrionale è meno alta di quanto finora ritenuto.
Nuove misurazioni hanno infatti abbassato la vetta del Mount McKinley di 25 metri a 6'168 metri sul livello del mare invece dei 6'193 riportati finora. Il ritocco al ribasso è dovuto a nuove tecnologie utilizzate dall’Istituto geologico americano.
Il McKinley si trova in Alaska, nella contea di Denali. E’ stato scalato per la prima volta il 7 giugno 1913 da Hudson Stuck. Dieci anni prima Frederick Cook aveva annunciato la riuscita ascensione ma in seguito ammise di aver barato.
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