No one knows how it got there, or for how long it has existed, but smake bang in the middle of Hojanne is a dragon shaped Island: Problem is, you can't get there no matter what. Massive, glowing walls of energy surround it on all sides, curving up and above it in a dome and reaching all the way down into the ocean floor.
Described as an annomally in time and space, the walls earned their name due to how they cause unexpected things to happen. Quite a lot of flotsam from different eras has poofed out of no where around these, including technologies so advanced it is beyond comprehension. Reverse engineering from these is partially responsable for Hojanne's status as one of the most advanced regions on the world.