Davius

Davius was a continent on Skaro and the original home of the Thals. It was separated from the continent of the humanoid Daleks, Dalazar, by the Ocean of Ooze. (COMIC: Genesis of Evil)

Behind the scenes

 * According to a map in The Dalek Book, but not a story, the continent was divided by the wide River of Whirling Waters. It contained whirlpools and could not be bridged. On the opposite side of the continent from the Ocean of Ooze was the Serpent Sea.
 * The existence of Davius, Dalazar and the Ocean of Ooze seem to be contradicted by The Daleks and Genesis of the Daleks, in which Thals, Kaleds and Daleks inhabit the same continent.