Board Thread:Manga/@comment-5774380-20161007195718/@comment-27321453-20161009193343

That island must be massive. The area inside the Walls alone is about twice the size of Germany, but the island is still big enough for the Survey Corps to explore for quite a while and still not find anything. And if that island is that big, then that continent next to it must be huge.

AoT may be taking place in this world but there doesn't seem to be any real world location that matches this. There's a possibility that it doesn't take place on Earth, or at least not what Earth looks like now.