The Skylands

The "Skylands" is the term for the upper layer of the world of Jhembaz, comprising the treetops and the other spaces open to the sky. Oppressively hot and bright, the Skylands are sparsely inhabited, though there is some life there aside from the trees. Notably, it is only from the Skylands that the sky and the stars are visible, which makes them a popular place to visit, if not to settle—especially at night. Sky resorts dot the Skylands where tourists can stay for a few nights in sight of the stars.
Common nonarborical flora of the Skylands include the glass fungus, a type of transparent shelf fungus that grows in large plates attached to the trees' branches; and the starflower, a type of brightly colored epiphytic bromeliad. Some of the better known large fauna include the white sunsnake, the humped greatrat, and the slow-moving assorad. The air just above the Skylands also teems with aeroplankton, which comprises microscopic mosses, fungi, and protists as well as the larval forms of some animals of the treetops, and which is preyed upon by many denizens of the treetops.
While not densely inhabited, the Skylands are not entirely a wasteland. Three major nomadic peoples, the Qasobi, the Baoma, and the Issins, roam across different though overlapping regions of the Skylands. Many nations claim parts of the Skylands while giving them little development, but a few nations have the bulk of their territory in this region: the astrophile nation of Aasegan, the spacefaring nation of Andekar, the isolationist nation of Ridi, the ascetic nation of Wat, and the mercantile nation of Zandora.
The Skylands are no more uniform than the other layers of Jhembaz; although it is all made up of treetops, the different kinds of tree and other features still make for wildly different types of terrain and biome. The top of the undead Witherwood in the eastern part of the world is a very different place from the bountiful Gods' Orchard in the north, or the mazy Rone in the southwest. The Skylands also boast three arboreal seas of significant size: the Wispwater, the Gazing Sea, and the largest of the three, the Airy Sea.