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Altitude acclimatization is the process of adjusting to decreasing oxygen levels at higher elevations, in order to avoid altitude sickness. [17] Once above approximately 3,000 metres (10,000 ft) – a pressure of 70 kilopascals (0.69 atm) – most climbers and high-altitude trekkers take the "climb-high, sleep-low" approach.
The second day ascends over Dead Woman's pass- the highest point on the trail at 4,200 metres. This is the most dangerous point for altitude sickness, though little time is spent at this elevation and the trail descends again to 3,600 metres. From here, the trail only descends until arriving at Machu Picchu at 2,430 metres.
Two high-altitude routes from Machu Picchu cross the mountains back to Cusco, one through the Sun Gate, and the other across the Inca bridge. Both could have been blocked easily, should invaders have approached along them. Machu Picchu and other sites in the area are built over earthquake faults. According to research conducted in 2019, this ...
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This reopening is being described as a ‘big step forward’ towards resuming normal tourism
The Historic Sanctuary of Machu Picchu [2] is a protected area in Peru covering over 35,000 hectares. It includes the natural environment surrounding the Machu Picchu archaeological site, located in the rugged cloud forest of the Yungas on the eastern slope of the Peruvian Andes and along both banks of the Urubamba River, which flows northwest in this section.
It is the closest access point to the historical site of Machu Picchu which is 6 kilometres (3.7 mi) away or about a 90-minute walk. There are many hotels and restaurants for tourists, as well as natural hot baths which gave the town its colloquial Spanish name, Aguas Calientes or hot water.
Acetazolamide, sold under the trade name Diamox among others, is a medication used to treat glaucoma, epilepsy, acute mountain sickness, periodic paralysis, idiopathic intracranial hypertension (raised brain pressure of unclear cause), heart failure and to alkalinize urine.