I dug up a book by Howard describing some of Conan's adventures. There's a map on the flyleaf. And on it, some formations are marked, roughly corresponding to Corsica and Malta(!).
Added 1 minute ago
The question is, did our hero visit them.
Interesting thought. However, since two quents fit the description, the uniqueness is lost. I'll need to look into it tomorrow.
For now, my list of possible worlds: Sesame, Ment, Dagr, Gur, Fragment, Uranium (possibly recruited, reduced activity after the second night), Drakkosha, maybe Yashchur
Negatives: Gekasan, WishmasteR
The rest - I don't know.