I don't know if this constitutes exploration of any sort, it's just a bug, really. If you fly kind of low over the entrance to the Frazzlecraz Motherlode mine in Southern Barrens, it'll dismount you. If you're high enough, you'll get the "Puddle Jumper" achievement that is one of the Deepwind Gorge BG achievements. When you're inside the mine, you are in a different CRZ than the rest of Southern Barrens, and you have the Preparation buff that you get when you're in a BG waiting for it to begin. You will enter the Deepwind Gorge global chat channel.
I don't know if there's any way to take advantage of that for any exploratory purposes or not.
Pretty odd! Credit to my guildie for accidentally getting dismounted there and piquing my interest about the spot.