Though it is difficult to conceptualize their realm - the best way to think of it is to imagine the space as an island floating in a sea of nothingness. Around the edge of the island is a high wall of cliffs that protect it from any who would attempt to land upon its shores.
Inside the island and beyond the wall of cliffs is a roughly round valley where the four Courts have claimed dominion over the island.
Each of the Courts control a section of the perimeter like pie wedges.
The closer that you get to the center - the less control any one Court has and so it's essentially neutral land.
At the very center of the Wilds is a large flat plane of grass and at its center is a massive Stone Table .