Introduction to Bagua Tian: "Bagua Tian" is a circular central depression surrounded by many fields. The scientific name of the central circular depression is "karst funnel depression". The locals call it Luoshui Tiankeng. Water has accumulated for many years. In fact, this pit is connected to an underground river, which can drain floods without drying up. The eight ring-shaped fields surrounding the depression are interlocking. Because the crops in the fields are of different colors, the ring lines look very clear, making it an ideal lens subject for photography enthusiasts.