Here's the inconistency, however...Originally posted by: Augury
When Shandra was pushed into the sky by the knock-up stream not all of it made it above the cloud's top, so Robin has been able to discover the center of the city beneath (inside? )the cloud. Robin pretty much figured out what the city's layout used to be by reading those ruins and then saw that she was only looking at the top pieces of the city structure.
Unless the city was built in a hardcore-defined valley or something, then most of the city being below the cloud surface would imply that most of the island surface would be below the cloud surface as well, however that doesn't seem to be the case.