It's been years since I played World of Warcraft, but I'm pretty sure that's Thunderbluff. Except it's in the wrong game! What we're looking at here is a procedurally-generated version built in Minecraft. Believe it or not, it's just a small part of an individual's near-total recreation of the game's continent of Kalimdor in Mojang's build 'em up.
As mentioned in the first paragraph, the Minecraft copy wasn't made by hand — I can't even begin to imagine how long that would take. No, the creator, who goes by the handle Rumsey, used a set of custom tools (elaborated on in this thread) to take World of Warcraft's models and correctly place and orientate them on height maps. Once he (or she) had established the right measurements, it was possible to build a block-by-block representation of the world in Minecraft. The default constraints of the game don't allow for block heights greater than 128, so a mod was used to make sure the replica was as accurate as possible.
Rumsey says that it's possible build the game's dungeons as well, with the eventual result being a Minecraft re-creation that can be fully explored. If you ever wanted to dig your way through World of Warcraft, this is as close as you're going to get for now!
An overview of Kalimdor, rendered in Minecraft.