Ah yes, I believe it is the Aleutians. It's hard to really see it well, but it looks like the blob on the right side is at the same latitude as the end of the chain on the left side. I assume the "edge of the world" for this purpose was the 180th meridian, which would leave some of them on the "wrong side."

Looking again, I see that Russia and Fiji also suffer from this problem, and those are the other two countries divided by that line.