my god square... my god
i'm going to ignore everything that's a part of the "ivalice alliance" until square releases a game that somehow answers how the high fantasy rabbit girl prancing world of ff12 connects with the dark and realistic tactics and vagrant story.
Tactics takes place roughly 1000 years after FFXII and around the same time as Vagrant Story. The Seeq and Banga, enemies in FFT have integrated into society. Very few Viera have traveled the world which is why many have never seen one. Also there are more than one Viera woods. Valendia (the country of Vagrant Story) was assimilated into the Archadian Empire.
Looking at the maps I'm pretty sure that Ordallia (or whatever that other country was in FFT) is to the west of the Tomb Of Raithwall, this part is an assumption.
The Ivalice of FFT Advance is just a city in a Fairy Tale world similar to Fantastica from the Neverending Story.