You can see Oriab as a tiny little item at the bottom of this map:
Here's a close-up:
I only caught this discrepancy (not that there can't be two different versions of the Dreamlands) because I've thought for a while now that Oriab would make a fine place for a vaguely Arabian Nights style D&D campaign. I vaguely remember reading that Baharna is sort of a Persian mercantile city, possibly full of Omar Khayyám style poets, Hashisheen, alchemists, etc. The ruined city of Tyrhhia, the Accursed Valley, and the nightgaunt-haunted caves of Mount Ngranak would make for plenteous dungeoneering action. And everyone would get to ride around on zebras.