List of superlative trees
I was looking up tallest/biggest trees in the world to get a feel for, well, how much bigger Aereaxera is than anything on earth (much)

(because the trunks on the map are not to scale; they’re not a mile wide.)

https://en.wikipedia.org/wiki/List_of_superlative_trees 

Deepest!  There’s a Deepest tree!

Tallest, not as tall as Aereaxera.  Biggest, not as wide around.  Then again, the sky islands were made by magic.