Bolivar, I think the reason that the FFTA2 map is so confusing because it shows a portion of the continent of Ordalia not shown on this(or any other) map that shows Ordalia. All that's known about FFTA2 is that it takes place in far western Ordalia(notice the far western edge of the continent is off map here) near coastal region that is very close to another continent, called Roaru - a region in Ivalice. My guess is that Ivalice is far bigger than any of us realize as the area where the Kingdom of Ivalice developes could very well be in that same off-screen area.

To note - looking at this map(which is also from FFXII) there's no way that the FFT map just "snaps" on to the end of the FFXII region(where FFXII actually takes place in)

All that being said - the FFTA2 map is still the most confusing, main because it can only be found in Japanese.