The Abbasid Caliphate differed from others in that it did not have the same borders and extent as Islam. Particularly, in the west of the Caliphate, there were multiple smaller caliphates that existed in relative peace with them.
The major difference between the protist and the animal kingdom is protists are unicellular protozoans and unicellular & multicellular, but animals are multicellular animals.
It is the only part of the continent that is not part of the realm, and thus the only place where particular attention is given to the difference between Westeros (the continent), and the Seven Kingdoms (the realm to the south of the Wall ruled by the Iron Throne).