Didnt see if this was posted b4 hope its not too old.Heres how i got to the bottom of av.
you start by going south of horde cave to this area
then you go behind the tree pointed to on the screeny. after that you should see
now make sure you are all the way up, ride the edge and spam jump you should end up like so
now that you gotten this far its just a quick run up the hill behind the tree, it may seem like you cant go up but just keep pusing and you'll get up there.
as you see from the screeny its just a short slow fall, bubble, or float buff down there. once you get down there u can keep riding to the edge but watch out water border will make u fatigue. but you can go all the way off the map, great for afking. Have fun,