To get here, go to Zangarmarsh and head to the center of the map, there you will find pipes of some sort sticking out of the water. If you go in the middle of them there will be a small tunnel that leads to a raid and a few dungeons. Once you get here head to The Underbog!
This run is fairly simple. You can run it on heroic which is what I did, because all you do is pull the first room of mobs. Don’t worry about heading up because then it’s just a waste of time.
9 minutes of farming gave me 50 motes! Which is 30 primals per hour, along with some nice rep and if you are an herbalist or Skinner this is the place for you.