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How to get to outland 
Take the " outland! 
". To gain access to the dark portal, you will need to take the " outland! " quest from either the warchief command board (horde) or the hero's call board (alliance). These can be found in all the major capital cities in azeroth.
You will need to be at least level 58 to start the " outland! " quest. Horde players can find the boards at orgrimmar, undercity, silvermoon city and thunder bluff.