True, but this is an area that has been settled for close to 4000 years. Even if agriculture is at Roman Empire levels, given magic and the effect of gods/godesses on the area, and the fact that the area has been at relative peace for the last 200 years, oh and add that the entire area has a possibility to be cultivated (unlike Australia or Alaska, or even my home Canada), then the idea of 1 person / sq mi is... questionable. Even Mongolia has a better density!