The World of Carnival Row consists of four continents. Mesogea is in the northern hemisphere on the western side of the ocean known as the Great Main. Tirnanoc is also in the northern hemisphere, on the eastern side of The Great Main. Ignota is to the southeast of Tirnanoc, separated by seas, with a land connection on their northern edges. Little has been revealed about the fourth continent known as Obscura, which lies south of Mesogea and the Silk Sea.
Humans and Centaur are both native to Mesogea, with humans originating in the continent's south somewhere near the Silk Sea and Centaur originating in the north. As the human population expanded northward, the Centaur migrated west and settled in the steppes of Outer Mesogea.
The Faerie originate in Tirnanoc. The Faun and Trow homelands are on the northern land connection between Tirnanoc and Ignota. Kobolds hail from a small group of islands in the seas between between Tirnanoc and Ignota. There is a Naga empire in southern Ignota.