Has Mongolia been mentionned as a possible place of survival?
It has quite a low population density (this is a country almost thrice as big as Texas… with about 11% of the population of Texas), very cold climate, with average annual temperatures at the freezing point (in the winter, the average gets to -20°C (-4°F), with nightly temperatures of -40°C/F (it's cool when it coincides in both units) being pretty normal occurences — it's worth noting than the capital, Ulan Bator, in spite of being much farther from the North Pole than Reykjavik or Nuuk, still holds the title of coldest capital in the world). There are several important mountain ranges in the western half of the country, but in fact the whole country lies at a pretty high altitude (average 1500 meters). Oh, and there are on average 257 cloudless days a year.
And of course the people there are used to survival in extreme conditions (because if the cold weather wasn't enough, the country is also very dry and the weather tends to be quite unpredictable on the short run), has quite a lot of herders, and the population are used to live with virtually no crop, relying almost entirely on animal products (the country has less than 1% of arable land).