Suffice to say, some of Termana's geography is "whacky". On the one hand, we have the almost Nordic Crilosians and the California Redwoods/Germanic Black Forest terrain of Ganjulael, the Forest Realm, while between those two relatively similar climates, there's the New Orleans-esque, Caribbean flavored Blood Bayou. Assuming Scarn is as round as the Earth, it makes for a curious contrast. Then again, part of the point of the Scarred Lands is that nature is out of whack. However, judging by the less Titan-tainted land around the northern half of Termana, and assuming Scarn's round, most of the continent likely sits north of the equator, while it dips slightly south of it around the Iron Sands, just like Torillan said. If Termana lay in the Southern Hemisphere, there wouldn't be a hot and humid sweltering hell of a jungle on its southermost borders, while it's northern portion tended to be a bit more temperate.
As for Asherak, well, everyone's just about covered that. Monks, nomads, desert, theocracies; looks to be like it will be a touch of Oriental, and a lot of Middle Eastern, and probably about as close to Dark Sun as third edition is going to have in the foreseeable future, minus the psionics, I can hope.