I want to be the first one to go on record (that I know of) with my designations for each of the main areas in World of Warcraft. I have already used:
Azeroth (including Eastern Kingdoms and Kalimdor) lands: Oldlands.
Burning Crusade lands: Outlands.
And now, introducing:
Wrath of the Lich King Northend lands: Coldlands.
There you have it, dispense as needed.