I wondered this as well. The Dangruf Wadi is a confusing maze without a map, which is not sold ... but I heard rumors of a quest to get it somehow.
Without a map I keep wandering as well, fighting goblins until the inevitable point where 2-3 of the tough ones locate me. Then back to Bastok to plot another Wadi trip.
Anyone have a map or directions to the geyser?
Thanks,
Shonassir