This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
In Warcraft III the Black Citadel was in Hellfire Peninsula. It was later confirmed that it is one and the same with Black Temple now in Shadowmoon Valley as seen in World of Warcraft. Some speculate the Mountains of Flame could be whats now known as the Hand Of Gul'dan, just with a similar name and location change.