the Explorer
From Wowpedia
"the Explorer" is a title awarded for completing 
World Explorer, for which you must completely explore all of the world maps for all continents in the game (Eastern Kingdoms, Kalimdor, 
Outland, and 
Northrend).
The title comes after the player's name, in the following format:
- <name> the Explorer
In addition to the title, players will receive the [Tabard of the Explorer] in the mail, upon completion of the exploration of Northrend.
Due to the terrain of Northrend, the achievement is not possible without 
[Cold Weather Flying], or some corpse running to get on to ledges that cannot be accessed by walking.
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