Keepers of the Balance
The Forbidden Lands aren’t actually near as exciting or forbidden as their name would leave you to believe. These places are just way too deserted and hot to really accommodate human society. They make up just about any desert area, and Texas. In other desert parts of the world, the desertification is actually reversing. You still cannot walk across the coast of Northern Africa in complete shade, but it’s slowly getting back to that.
Not to say that some humans don’t live there, nor that they’re bereft of all life in general. There are plenty of wild animals, plants, and non-humans acclimatized to the Forbidden Lands. There are some desert nomads running around the Middle East part, and the Nile is teaming with life. Australia pretty much only has the Aborigines and non-humans.