For the sake of simplicity (we need a little of that ...) I am going to assume these are powerful and large countries (they must be, if people have heard of them all the way over here in the Flanaess!)
So ...
The Empire of Lyrn (humans of unknown kind, demihumans of unknown kinds, humanoids of unknown kinds, many kinds of monsters from the MM, all alignments) PL 25
The Empire of Erypt (strange humans, genies, many kinds of monsters from the MM, all alignments) PL 35
The Empire of Ishtarland (humans, demihumans, humanoids, genies, all alignments) PL 40
The Empire of the Yuan-Ti (Yuan-Ti, Hempmonalander humans, slaves of all types, evil) PL 30
The Storm-Riders of Hyperborea (humans, small sentient tornadoes, spirits of the earth and sky, demihumans of unknown kinds, humanoids of unknown kinds) PL 35
The Elven Imperial Navy of Greyspace (spelljamming elves, neutral and good) PL 15
The Dwarven Citadels of Greyspace (dwarves, spelljamming mountains, neutral and good) PL 25
The Gnomish Sidewheelers of Greyspace (gnomes, neutral and good) PL 10
The Scro Armada of Greyspace (spelljamming scro, evil) PL 30
The Illithid of Greyspace (spelljamming illithid, slaves of every type, evil) PL 25
The Neogi of Greyspace (spelljamming neogi, their umber hulk servants, slaves of every type, evil) PL 30
The Gith of Greyspace (spelljamming mercenary gith, neutral) PL 20
How's that?
Some new powers for people to claim.
Hyperborea is the great polar continent north and northwest of the Flanaess.
Lyrn, Erypt, Ishtarland, are all far away on the western side of Oerik, Oerth's greatest continent (of which the Flanaess is the easternmost part.)
The Yuan-Ti Empire is deep within Hempmonaland, although they have an infamous seaport on the coast south of the map.