I have been a tree navigator for a while now and my tree setup starts to be
somewhat stable, so I documented it to:

https://thelo.blog/info/navtrees/

Basically, 21 trees in total on four different continents. The links between
trees are star shaped: there is one main tree, which contains links to other
trees and the other trees usually contain the link only to the main tree.

The web page has has the locations and the links in a graphical format, here
the main tree locations in text only:

Laenor:
365, 480 "aresc" (5 s from SC)
Links: mist, fulgurite, newbiemtn, northrend, darkcastle

Lucentium:
413, 142 "lorenchia" (20 n from Lorenchia central park)
Links: astacia, cattree, monk, swamp, vk

Rothikgen:
217, 264 "sha" (2 n;14 w;7 n from center of Shadowkeep)
Links: peril, aldor, beast, taiga, icecastle

Desolathya:
300, 302 "tibu" (1 w;3 nw from Tiburcio)
Links: carnival, orac

For now, my I have reached my tree limit, but I can probably grow more trees
before end of the year.