User blog comment:UndeadHero/10/6/XX12 - I NEARLY FORGOT!/@comment-3387274-20121007100234

The spherical island that floats above the grandline, and had such strong gravity it dragged away Biege's ship. I'm pretty sure that was an island anyway. Or the one where Apoo found himself running on an invisible floor. We haven't seen much of the new world, but both of these things looked like they have an explanation on the way...