The geography understandably changes between each video games - not because of a time gap but rather to keep the gameplay interesting. In the original Tactics Advance, Ivalice is described as a parrel world from our very own, and can be accessed via a book. However, the sequel takes place in the actual world of Ivalice. Ivalice is known as an area where magic and machines exist together in a midevil setting of sorts. It first appeared in the Playstation 1 video game Final Fantasy Tactics, and was concieved by Yasumi Matsuno.
List of video games
Final Fantasy Tactics Advance - A sequel to the original Final Fantasy Tactics game, this was the first Ivalice based title to appear on a Nintendo console.