Hello All

Back with a question of course...

Situation: I'm in South Shroud, Quarry Mill. I took the leve quest Rocky Wall.

Problem: I can't reach the location indicated by the green circle on map.
I tried from all directions, down, up. I searched for a tunnel or a cavern or a bridge or whatever, but no way. I can't go there.

Questions:
- Is the quest marker correct?
- If yes, how do I reach the corresponding location?