Ianite's Prison is a cage floating in the sky during Season One that was broken out of by Ianite. She was imprisoned in it by Dianite so that she wouldn't be able to foil her brother's plans. The coordinates were given in a book titled "DO NOT READ" which Mianite had given to Jordan.
One day, Tucker and Sonja were rummaging around in Jordan's chests and found the book and the armor that Ianite had given Jordan. The two Mianitees went to the coordinates to investigate, and to their disappointment, found nothing but a message from Jordan's goddess.