The Universe

The Universe is made up of the central bubble, which includes our world and the Elemental Plane, the Inner Ring and the Outer Ring

Our World
Our world is in a bubble, and consists of our world, and two mirrors, the Wildlands and the Shadowfell.

Elemental Plane
Outside of that bubble, but inside the Central bubble exists the Elemental Plane, a prison created long ago to keep the Primordials away and trapped, fighting one another.