The Astral Plane

“It is the space between everything. It is the road that goes everywhere. It is where you are when you aren't anywhere else.” — Manual of the Planes

The Astral Plane, also known as the Astral Sea, is a barren place of other-dimensional nothingness extending in all directions, dotted with chunks of matter broken off from other planes.

According to the cosmological model of the World Axis, the Astral Plane connects the Prime Material to the first layers of the Outer Planes.