My setting is going to be near the 5e Sword Coast. My story is that the Sundering has brought back a creator race from Abeir, and I want them to have a presence south of what used to be Maztica on the western continent of Faerun. I don't think that area was developed, so I'm going to add in my own homebrew area there.
I'd like to start the adventurers in a town that appeared on the Sword Coast after the Sundering. My story is that the town was either veiled by magics and the Sundering lifted the illusion, or that the town actually was brought in from Abeir. I'll probably go with the latter since the style of the town is Moroccan/Gypsy. It was a port town, but now lies tens of miles from the sea and has to reinvent itself as a center of education and training in the arts and magic - new things to Toril that this town can capitalize upon.
Is there a good location for this town to exist, or for my progenitor race to exist that hasn't been developed? Have I already chosen good areas? I know Sembia used to be a huge, undeveloped area for homebrew adventures, but that has changed and I'd like to know of other places that are still left to the imagination.