Hi! Let me contribute whith some information.
Actualy,Monte San Valentin (aka San Clemente) had his altitude accurated to 3910 mts, it's still the highest peak in Patagonia Sur, not including Lake district and Bariloche/Volcan Lanin area, followed by Cerro San Lorenzo,3706mts. Fitz Roy coul'd be considered the third, folowed by the two remote peaks inside campo de hielo sur (south patagonia ice cap) Mount Mariano Moreno (3393mts) and Volcano Lautaro 3380 (activity was experienced by British climber John Biggar).Some sources claim Volcan Domuyo, 4700mts as the highest peak in Patagonia...but Technically, Patagonia beggins at the latitude of Monte San Lorenzo...
Igor Czs- Brazil
thanks for the additional information/corrections. I will update the page accordingly.
If you need any information, i'll be glada to help you...
If possible, tell me more about your stormy experience on Volcan Chachani, Arequipa....I'm planning to climb this peak October and El Misti also.
There is some confusion about the elevation. It was originally estimated 3.876m by Nordenskjold in 1921 but later thought to be 4.058m. The latter is the most commonly quoted elevation and should also be quoted here.
A French group climbed the San Valentin in 1993 and included two surveyors, who calculated an elevation of 4.080±20 m using a GPS. In 2001 a Chilean group measured 4.070±40 m during the ascent using a GPS. SRTM data also supports an elevation above 4.000 meters, but the Chilean IGM map quotes only 3.910 metres. ChIGM maps are usually reliable, but the summit is uniformly white, which may have created problems for the cartographers.
Just found the Cordillera Darwin Area/Range page (http://www.summitpost.org/cordillera-darwin/561431), it would be good to make it a Child to this Patagonia page. Thanks.