This is the center of The Great Wheel of Cosmology with all other planes surrounding. Worlds of the Material Plane are infinitely diverse, but it was not always so. Some legends speak of a primordial state, a single reality called the First World, where many of the peoples and monsters that inhabit the worlds on the Material Plane originated. After the First World was shattered by a great cataclysm, the many worlds were formed like reflections or (in some cases) distortions of that original reality.
Some myths describe a great tree that grew on the First World at the dawn of time. Planted and tended by the god Corellon, this tree was a seedling of Yggdrasil, the World Tree that connects all the Outer Planes. When the First World was destroyed, seeds from this great tree scattered into the void of the Material Plane. Legends say that these seeds sprouted and formed worlds of their own—all the myriad worlds that now constitute the Material Plane.
This is the plane where Zafaria exists in.