It took some time to search for this place, once did was so simple once you checked the map. Once you come out of Stonetalon mountains (by road) fallow the mountains on your left side it is in North/East  mountain section between road and a place called "Sargeon" look for Lights and collums plus guards in front  of the path.  When you stand at the sign post that says "Nigel point" the sign points east but move N/E. you can even see the tall collums from the sign. once there  you get more quests plus a new flight path. hope this helps.