Primus

"I'm not from here, I'm from Primus—another dimension."

- Ivy Hensen to James Norrelai

Primus is the first dimension of the universe, given that the creator of inter-dimensional traveling was from Primus.

Author of the novel has stated that Primus is based on a more modern and futuristic Earth, but it has the same shape and form as the real-life continents.