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The Wiki World is a small continent (compared to other continents) that takes place on the planet Penitus, a world very different from Planet Earth. The Wiki World is huge and contains many wiki areas such as Wikipedia, Halopedia, and the Mario Wiki. The Wiki World is full of trolls, who don't only attack the Mario Wiki but other wikis as well. The Wiki World is protected by its Patrollers, Sysops, and Bureaucrats, although regular users and, in some cases, Guests, can defend the Wiki World as well.
Though Wiki's End is not considered canon by some, in the comic it shows that there is a way to easily get from the Wiki World to the real world (a.k.a Earth).
There are four sections of Wiki World, the Major side, Editthis, Refereta, and Wikia. There used to be a fifth, ScribbleWiki.
The Major side contains wikis such as Wikipedia and MarioWiki. Editthis contains the old MWUserpedia. Referata contains Kingbowser99's Bowsepedia and Userpedia-Refereta (the latter being unofficially taken over by trolls). Wikia is where Userpedia-Wikia is located. However, Userpedia-Wikia has been shut down after an incident with Maria Thalia and other trolls.
The fifth side, ScribbleWiki, was the most popular side, although it got attacked by a virus and permanently shut down.