Unlike other alternative timelines, Arthur's world was a natural alternative that had sprung from the universe. (PROSE: No Future) On this Earth, King Arthur was a historical British king and not merely a shadowy figure of myth. It produced several exceptional sorcerers (or users of advanced psychic powers). Arthur's World was accessible from the Doctor's universe. The exit point in the main timeline was located in Carbury near Lake Vortigern, in rural England. An interstitial vortex linked the dimensions.