The Valley of Lies (偽りの谷, Itsuwari no Tani) is what Ameyuki calls the area surrounding Shangri-la, because so little of what happens there is as it appears. The river that runs through the valley produces a pleasant aroma whenever the water levels rise, which the residents of Shangri-la use as a medium for genjutsu: the genjutsu makes Shangri-la invisible to visitors to the valley and otherwise leaves people with positive, cheery feelings.