It's not Arabia, it's a caliphate i modded in, it gets cores in North Africa, arabia, persia, and most of the middle east till near Georgia.
plus i was playing Miscmods, that has a arabia, that i removed and added this caliphate, i started as Hedjaz and am a horde
i made 3 governments, the first one i can get asap as Hedjaz or as any other country after forming the Ummat al-mu'minin, it has some nice bonuses and almost the same thing as steppe horde, with a smaller tech penalty. the second is still a horde, requires 7 government tech, a 6 admin king and some other things, it gives no maluses and in bonuses it is almost the same as the first, the third is the most powerful overall, giving lots of bonuses, no maluses, many magistrates, and is not a horde, it requires government 10 plus a good admin ruler (7, but i may change to 8)