Well, Greyhawk Adventures has The Pinnacles of Azor'alq. We are told (p 89) that "the Pinnacles are not more than 50 leagues from the mainland, somewhere in the angle of the Dramidj between Ekbir and Zeif" and also that "Whatever else dwells among the pinnacles, it is certain that dragons of all sorts and sizes make their home there, from tiny varieties that sport among the beautiful and unique birds of the forests to huge coiled reptiles."
To me, this is why it makes sense to link Dragonborn to this part of the world.
Well, a decade after Greyhawk Adventures, we got The Scarlet Brotherhood, which tells us that Tabaxi live in Hepmonaland. Which does not seem all that far-fetched!