Lyoko
Lyoko (/liːˈoʊkoʊ/lee-OH-koh) is the virtual world contained within the supercomputer. It is composed of five different regions or sectors, each one representing a different landscape and environment. The first four being the Forest, Desert, Ice/Polar/Glacier, and Mountains, superficially resembling various real-world landscapes, climate, and ecosystems. The fifth sector, Carthage, serves as the central hub of Lyoko; it contains all of Lyoko's data, and X.A.N.A.'s as well. It also contains the Core/Heart of Lyoko itself, the code which maintains and supports the whole virtual world; and the hangar for the group's virtual submersible ship, the Skidbladnir. The first four sectors are arranged by four points leading to the center, around the fifth sector, a ball like figure. All five sectors are eventually destroyed by the end of the third season; by destroying the Core of Lyoko in the third season finale, X.A.N.A. made it so that the quintet would no longer pose a threat to him and his evil schemes to rule the real world. In the fourth season, all five sectors are eventually recreated by Jeremy and Aelita due to a recreation, restoration program given to them by Franz Hopper.
Read more about this topic: A World Without Danger