"Treesland" is a VERY broad term to described the area around the Worldstree, surrounded by the Elfpass Mountains in the Northwest, the Mistflower Jungles to the north, the Opaline Ocean to the east, the Spine of the Land to the south and the Stormy Sea to the Southwest. This covers a huge area, about 3000 miles by 2500 miles.
Treesland is easily divided into many smaller areas. First are the various Nations, especially Naelaceron, Elaceri, Celenest and the Faunlands. In additions, there are entire river systems and smaller mountain ranges within it.
Treesland is basically a deciduous forest, primarily hardwoods. The
Flora of the western and eastern areas differs significantly, and the Forest
fades into Taiga just south of Celenest.