The landmark related missions seem to be bugged at the moment; I'm trying to see if there is a work around. It's suggested that visiting them before getting the mission bugs them, but I've had trouble with the Low Lands mission, and I hadn't been anywhere near the landmarks.
Visit the landmarks of Terai, can't figure that out, I visited the cave and the one in the river, but the mission mark stays on them
The landmark related missions seem to be bugged at the moment; I'm trying to see if there is a work around. It's suggested that visiting them before getting the mission bugs them, but I've had trouble with the Low Lands mission, and I hadn't been anywhere near the landmarks.