Northrend is actually north of the Maelstrom so technicly its in the game, but theres no map or even map file. ED Is in the game, as with its map files. I've been there since 1.8 and nothing's changed with 2.0.10 (I quit WoW but I know this and ill be playing again soon). Argus could be called Beta Outland pre-2.x. Beta outland was pretty much SouthEast the center of kalimador, but was only reachable on the Eastern Kingdoms. Weird I know but I went there. ED is so far an INSTANCE. It's pretty much sealed off but there is a way to get there as of 2.x. Undermine could be considered the little world beneath WoW since getting under 500 feet or miles means auto death, so it could you landing on the Undermine... Thats just my thought on this, not saying i'm right on Undermine or Northrend or that naga capital which is located inside the eye, and underwater azshara pre 1.5