Ah, Ive never played pre Morrowind so I wasn't aware. Informed though, thanks. But it still stands that having another game with 2 regions would be cools.
The catch is, Daggerfall took place on the Illiac Bay, that connects High Rock to Hammerfell. Not the actual two entire provinces.
Now, If Bethesda was to do something similar to, say, Black Marsh and Elsweyr, we'd have the warm sands of Anequina, and the harsh, mysterious swampy Black Marsh.