Southwest of Altair in FF2. On the continent southeast of Baron in FF4.
Mysidia is located Southwest of Altair in FF2. You can actually reach it in the very beginning of the game but you'd have to be the luckiest person alive to be able to make it there without being decimated by the random encounters. If you do actually make it there, its a great place to buy tomes and level up, assuming you live long enough to actually kill some monsters to earn the gil. In FF4, Mysidia is located southeast of Baron and directly east of Agart (The island with the giant hole in the middle). Iits on a land formation that looks like a Dragon's mouth.19:31, May 1, 2013 (UTC)