[Gold & Appel Inc]

Nitpick: It's in the southwest.

I've never paid much attention to the Djinn Lands, because they've never come up in my small number of Yrth games and I find them a little uninspiring. If I was going to flesh the Djinn themselves out, it would probably be only a little, as shadowy background figures backing the face-to-face antagonists who are making life difficult for the PCs (ie: bedouin tribesmen engaged in a brushfire conflict somewhere the PCs want to be, like around an ancient ruin they want to explore/loot, or on the route of a caravan they're guarding). I picture each having an Elven name that they use among themselves on the rare occasions that they communicate, a name belonging to their vessel that is long-forgotten and would only be important as a vulnerability for certain kinds of magic, and a fanciful use-name that is either self-chosen or bestowed by their slave/cultists and reflective of the sort of obsequious thing a bunch of terrified tribesmen would call their personal minor patron deity, like, "The Voice of the Desert Wind," or, "The Watcher in the Sky Over the Dunes," or something.