I can feel that there are places where the soil is loose instead of rock. And I can feel places where it's wet from the water above. There are even tree roots coming through.

[he crawls out further, looking around as much as possible, but it certainly appears that the bottom of the island is literally... just the bottom of a giant rock. it's not really remarkable, except for the incredible view spread out below them.]

...what holds the water there? Why does any of this work? This isn't like the wells under the Tree, this is all in this realm...