Well, we could make the geographical "center" of the setting a really tall mountain range, like the Himalayahs. The nations in this mountain range could resemble Tibet, Nepal, Bhutan and so forth. (And, since this is a fantasy setting, we probably have a whole bunch of dwarves living below the surface...)
To the north, the climate is relatively cold and dry, just like in the real world. Thus, there won't be many chuul there, but humans can eke out a living in these lands. And with the support of magic, these regions might be able to support more people than in our world.
To the east, far west, and especially to the south the weather is much wetter, and the chuul thrive there...
Is that a start?