The east side provides a good protection from the occasionally strong west winds. In this case its the better choice than the normal route. But Incahuasi is steeper at the East. So the ascent includes steep sections in scree or snow and an easy climbing section (grade II) in higher altitudes above 6000 meters.
The approach is the same as for the North ridge. Walk or drive from the Las Grutas border post to the spot which is called "base camp" North-East of Incahuasi. This point is already very abandoned, so probably you won't find any hints of a base camp there. The only things you will see for sure are sand, grass and vicunas. There is no water at the "base camp"!!!
From the starting point its a 4 hour walk up to the first camp site at 5000m. The camp site is a large plateau direct south of the volcancitos, the two dark young volcanic cones. Pass the volcancitos at the right (West) side. Don't expect water or snow at this place. Occasionaly there is a sandy river coming down from the South.
From camp 2 several different routes can be chosen left from the ridge.
For the descent one can use the same route. But a faster alternative from the summit plateau to camp 2 is the next gully to the North of the ascent route. So it's only 30 minutes from the plateau to the camp. For an ascent the gully is to steep and the scree to lose. Keep attention to possible rock falls.
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You need only the normal Puna equipment, especially walking sticks. If the conditions are save, this route can be done in simple hiking boots, but take care of the weather. Crampons can be useful but are not necessary if there is only few snow on Incahuasi .
Up to camp 2 it's not certain to find water or snow, so bring enough water for the first days and the way back.