This is the least area where zombies can multiply. These areas may be uninhabited which means no food for zombies. However it also means no food for living creatures. You might also suffer from hypothermia.
This is one of the greatest hiding places. You can have a lot of ammos and guns for protection. Since most of the bases are far from cities, you would also be out of range for zombies. Just make sure to get used to eating canned goods.