Under Kalimdor from Tanaris

[skogemann]

Ok so go to the Tanaris Neutral Auction House.

Use a Elixir of Giant Growth when you're standing like this:


Then jump alittle forward, and walk slowly towards the edge, till you can use your mount:


Fly into the 'nothingness' and badabam badaboom, you're under Kalimdor.

[SacredSpenny]

Wow goodjob, +rep.

Now to find that neutral auction house...

[Traxex84]

In Tanaris it's down some stairs next to the guy that sells noggen fogger.