Who knows where this cave is? (The Witcher 3: Wild Hunt)

2 times I finished the Witcher, completed all quests, explored every corner of the world (not all), got all the achievements.
Now one mod on Russian translation. What would to do everything, try all the changes. And here I was looking for at least some of the enemy to pass the test. effect. And stumbled upon the entrance of the cave! On the map it is not marked, and I do not remember it. Inside is full of ghosts, kind of like a crypt, and nothing lutana, so I wasn't there. Who knows where this cave is?

UPD: I figured it out. It's a cave on the quest disturb the peace. I'm just on the other side hit.
But unfortunately the theme is not deleted.