Phantasia

Phantasia is the kingdom of Fae.

Geography
Only one part of Phantasia has ever been seen. Khi described it as "a circular courtyard that had a floral mosaic on the floor. The courtyard was framed by Grecian-style marble pillars with archways at intervals—the kind you’d see in, I guess, the Taj Mahal or something. There was no roof. I saw trees beyond the pillars and arches, vibrant and otherworldly, with leaves like maple and bark like redwood."

A later paragraph also says: "I looked around and walked beyond the archways toward the small forest, where I laid my hand on a tree. I could feel a thrum, consistent, like a pulse. The pulse of the universe? No, not the universe. It was the pulse of all the universes. I could feel each individual one within the heart of the tree." This suggests that Phantasia has some intrinsic connection with the Universes, but is not necessarily a universe itself.

Trivia

 * Phantasia means fantasy or phase in Latin. This is fitting, because Phantasia is a kingdom of fantastic creatures (the Fae)