Mount Everest is the point of highest elevation on Earth, measured by the height of its summit above sea level. Its summit ridge marks the border between Nepal and China.
Mt. Everest has two main climbing routes, the southeast ridge from Nepal and the northeast ridge from Tibet, as well as 13 other less frequently climbed routes. Of the two main routes, the southeast ridge is technically easier and is the most frequently used route. It was the route used by Hillary and Tenzing in 1953. This was, however, a route decision dictated more by politics than by design as the Tibetan border was closed to foreigners in 1949.
Most attempts are made during April and May before the summer monsoon season. A change in the jet stream at this time of year also reduces the average wind speeds high on the mountain. While attempts are sometimes made after the monsoons in September and October, the additional snow deposited by the monsoons makes climbing even more difficult.
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