Taking into account monster spawns, region stats, geography, travel times, seasons, some regions are nearly useless alone. If part of a realm, some regions would be almost useless. Balance's Retreat comes to mind, though it could serve as a southern barrier for a realm situated in Unterstrom. The entire Twain/Rettle/ville area is evil with its monster spawns in its forests. The Zuma lands, they're supposed to be doomy gloomy. The middle islands are varying. Libidzedd is pretty much pointless without more lands on either side of the mainland. In this case, it's Astrum on the west. The Port islands are ok, except that alone, they have two cities, two townslands, one stronghold, one rural. That is not going to be self-sufficient, and I'm not sure how well most players would take at being another realm's playtoy. Judging by how Atamara looked until recently, probably quite well. Of course, trading relations can be built, but right now the number one producer of food is probably the Morek Empire with its many rich rurals.
Oh, and Sallowtown and Balance's Retreat aren't exactly connected, because between DoS and West Divide, the travel time is a bit high. That entire region in the east mainland has next to no food production, almost no income except for about 800 gold by default screen for Sallowtown. If whatever realm holds the Port islands also wants to hold Sallowtown, that would at most be providing extra mouths to feed without any significant returns in income.
Now Madina...that's a pretty good place. Too bad the enemy during this iteration is human politics, not really factors of the land.
