Allotheia is not a country in any technical sense of the word; it is a name the elves originally gave to the lands that were so rife with monsters, or so monstrous by their very nature, that they could not be tamed or inhabited by any civilised race.
Nobody knows what lies beyond Allotheia; some fear that whatever makes these powerful creatures continually try to push south must be something much, much worse.
To the south Allotheia shares borders with the civilised lands of Paregor, Talaria and Barathrum; these borders are formed by a series of strong walls, heavily reinforced and desperately defended. Occasionally some of the wilier or stronger inhabitants of the monstrous realm of Allotheia fight their way past, or slip through unnoticed, particularly if they are able to fly; even more rarely one of the fortresses is sacked and the wall is entirely breached. Those are dark days for the race of men.