Board Thread:Theories/@comment-27938131-20160922094959/@comment-26932251-20160922215323

It likely is a landmass separate from the rest of the world, possibly an artificial landmass because we never actually see any landmarks of any kind that could correspond to the real world and what we know of the landmass is actually contrary to the real world such as the fact that both inside and outside the walls there are multiple forests of giant trees.

Furthermore, it would make sense. We don't know how titans handle open water, so we have no evidence that titans can swim. Assuming they would sink if placed in deep enough water, then assuming that being underwater doesn't directly kill them through suffocation or some such process, as they would attempt to cross oceanic depths, the water pressure would most likely damage their napes enough that it would kill them. So, yeah, deep enough water might do the trick and so the rest of the world is likely a landmass.