I went through the entire location, but the map displays 25 out of 26 places found, as well as 25 out of 26 places passed. In this regard, the question is a bug and I’m not alone, or I really haven’t found this place yet (although I’ve already covered everything) ... Maybe someone has a full map, discard the screen.
in the neighboring county, you will receive the task to destroy the bandits' lair, it will appear on the map along the road that has been used a hundred times. Perhaps this is it.