Here's a comment I received by email:
I enjoy your watershed journal-it is very useful and informative. I think you need to check your elevations in the Everglades. Tree Islands are not the highest elevations embedded in the ecosystem. The pine keys of ENP and Taylor Slough, are relative "nose bleed" country. And, yes, as much as our local hydro folks try to erase them from the ecosystem-they are clearly part of the Everglades.
Rick, Everglades Nat'l Park.