Board Thread:General Discussion/@comment-26066818-20151018181718/@comment-1005679-20151019023242

I was curious enough to look into this. In Fantastic Four Vol 1 47 (which I believe is the very first appearance of Attilan, but they called it the Great Refuge) it's definitively in the Andes. In the comic, Reed Richards placed a tracking device on a vessel that some Inhumans fled in, and... There, in the Andes, is where they found the "Great Refuge"