Is it possible to enter Ulukk's Hunger?
if you already have ulukks hunger on your map, then you dont need to go inside.
You are most likely missing area’s in timberline.
It seems to be possible, though I haven’t done it myself. I once got this answer here, which reminds me I really need to check up on that place, for completeness’ sake.
Ok, it seems that since Halloween event, you can access that area by entering a portal in the ruins just west of Wyrmblood Waypoint. The area is a mini dungeon called Forsaken Halls.
actually, in my understanding, you enter it if you choose to observe/help the grawl during your story mission. Likewise with that one place behind the gate in the ascalonian area (ogres) and the skritt den area in harathi. However you get map credit for it by simply hugging the gate.
Drevin is correct, You can enter the area from the ruins at Wyrmblood Lake. It takes to to ‘Forsaken Halls’ which is part of the Explorers achievement for Shiverpeak.