This discussion has a pretty amazing number of references to fantasy or science fiction worlds. I count eight so far.

* WoW - Zangermarsh

* Elder Scrolls - Vvardenfell

* StarCraft - Mutalisks

* Smurfs

* Mario Brothers

* Jules Verne - Journey to the Center of the Earth

* Miyazaki - Nausicaa and the Valley of the Winds

* Paul Stamet - Mycelium Running