From the Depths of Azjol-Nerub

The undead Nerubians that attacked Icemist Village came from a gigantic sinkhole known as the Pit of Narjun. If left alone, those fiends will no doubt flank our forces at the Wrathgate and end our march to victory. I need eyes on the ground, <name>. You are to head west and investigate the Pit of Narjun. We need to locate their primary exit point and seal it off! Find me that location.