The world consists of a few layers.
- Surface: You've got the normal (well as normal as can be expected in a fantasy setting) surface world consisting of a few continents and vast areas of ocean.
- Skybelt: Then you've got the skybelt, a scattered field of floating debris, some of them having balled together over time to form small islands. Typically, these rocks are dense ores that have been left behind after the winds and rains scrubbed the outside. There are groups that go mine these, but it is dangerous and expensive work.
- Skylands: These are the floating continents, they ride above the skybelt and meander about the world. Legend tells that powerful wizards and sorcerers are able to control where they go, or even bring them crashing down onto the surface below.
- World's edge: Really, it's just the skybelt, but at the very extremes of the world. Very little is known about this harsh environment.
- The floating lands and debris do so by an unknown mechanism. Gravity otherwise works as expected; if you fall off you don't come back.
- The floating lands somehow cause the air density around them to increase, resulting in roughly the same band of air pressures that the surface has across it, albeit with some variety. The smaller the land, and the farther away from the core of it you are, the weaker this effect.
- Depending on the distance needing to be travelled, when traveling from the surface up to these lands and vice versa, travelers need to protect themselves against the environment and bring sources of air.
- The lands do not have static heights, just as the wind currents can push them around, they can also lift these lands up or carry them down.
- There are (flying) creatures that naturally go between the various levels of the world. Flying creatures tend to make up most of the native population of the upper layers, with humans and other races having brought domesticated animals up with them, and the occasional monster for selling to rich nobles.
With all that said, what would the flora of the skylands be like? Would it be possible for surface flora to pass up to them, or would they have their own type of vegetation? Would the winds just blow everything away instead, leaving them barren landscapes and thus forcing settlers to build contained areas for farming?
- The skylands vary in size from small (Australia size) to large (Africa size). They do have rain patterns, though admittedly, I'm not sure whether they'd be normal though, I've been running the wind/rain patterns based off of this question.
- Water is able to partially permeate though, there's definite areas where the "crust" (I guess that's the term I should use for lack of a better word) is thinner, but for the most part, it'll either get trapped in aquifers, or run off the edge in waterfalls. I'm not too worried about the waterfall's effect on the ground, as I believe that the deluge would disperse into a rain or mist given the constant motions of the continent as well as the winds between it and the surface