Tar Mordan (TAG page 19) has got Calidians and Sun Mages living in close proximity. So conflict and adventure are a strong posibility.
Many rumors abound about why and how Iatan has remained free but the most likely is simply that the Eladrin nobles don't want a war so close to their resorts. Of course, others find that a surprising number of Eladrin expatriates and ex-slaves leave from Iatan to enter the wider areas of the sphere. In fact, elves and half-elves from Iatan are never allowed into the elven military, regardless of how thorough a magical check they pass. Such is the fear of spies and saboteurs.
This is a gas giant with three major moons (Sharya, Thuma, and latan) which are held by the Sun Mages and Calidians. Sharya holds many resort settlements, catering to the pleasures of all races. Thuma has a very small population, but as a water world it is very valuable to the Sun Mages’ inner settlements.
The Calidians have managed to hold latan, though it is only a matter of time before the Antilans get serious about seizing that moon as well. For now, the Calidians use latan as a farming colony, providing food for their more distant settlements.
Mordan - Gas Giant with three major moons.