First of all I must say that I love all of Blizzard, especially all the nature in their maps, I found this one when I was online on my mage, questing. I'm sorry if this is bound to one spell, I havn't tried doing anything else.
But it's nothing special about this one really, just another blink bug. Maybe there is other things to do to get you past this problem, there's possible to do other things at several blink bug locations, dunno about this one tho.
EDIT;
Mortenzlol just confirmed that it works with autounstuck, just make sure you got CD on your HS!
Pictures;
This is exactly where you will stand when you blink.
This is between which mobs
Spot
Better view of the spot:
It will look something like this
EDIT;
If you don't want to worry about accidently flying out from a mountain, you could always fly down this path (can't try it on this char because I'm not 77 yet, so no flying mount, but I did go down with slow fall and it worked as I thought it would. If you got any experience of flying under the map, you'll understand )