I think most of them in the central Three Seas are extinct, but there must be some, although I expect they're rare, and most probably either stay underground or have relocated back up north. Do we know where the "Four Revelations" story took place? If we assume that it really was Conphas in that story (I personally feel confidant that it was), then it can't have been THAT far north, even if it took place during the wars he lead against Saubon?