Serenierre
Established Nation
Maintaining the status quo does not seem like an option. I feel like those slots are going to be perpetually empty which mean in essence no culture will occupy them because no nation will.
Also, it should be said, if I remember correctly, that Sarmatia was only made larger so that we could fit the map on the globe, before that there wasn't this problem of a pixel waste land (at-least not to such an extent).