There are numerous planes of existence that make up the Multiverse, though the average person will see none of them during their lifetime. The ones listed below are the ones known to the most scholarly of sages in the towers of Leofins.
The Material Plane
This is the plane of existence Avo is in. Many other worlds are on this plane too. In Dorian Lotus cosmology, the Material Plane is the seed pod in the center of the lotus blossom. Valwyr adopts the Great Wheel cosmology, as do many of the other lands, if they even believe in planes in the first place. It is believed that many other worlds also exist in the Material Plane. Prior to the Divine Wrath, each world was contained within a crystal sphere which floated in a white ether. Post-Wrath, the Astral Sea has bled into the space between worlds on the Material Plane.
Worlds in the Material Plane
Known worlds within the Material Plane include, but are not limited to:
Surrounding the Material Plane are various Inner Planes. These are planes of the primordials, created out of pure materials.