I just read something about 3 continents of Toril that I never heard about. A place called Osse (above Maztica) and one under Maztica. A third continent with a name like kataswaka (or something like that) was also mentioned and it was located south west of Kara-Tur (like Australia in our world)
Is this cannon? and where can I find more information about those places? I'm playing third edition and I'm going to start a campaign BEFORE Abeir and Toril came together so ... :-)