[rissole25]

Well Barhiem passage is blocked off from where you beat the Mimic Queen so you can't go in there anymore. But it opens up later I thinkl. But thats in the Estersand. The Zertinarian Caverns are in the Westersand and several other places but not the Estersand.

And the entrance to the caverns is just a big cave so you should find it easy.