It develops on the river valley in the downstream of Qijiehe River and it is the underground river cave of Qijiehe River. The cave is 1040m in elevation, 400m in length, 60-70m in width, and 46-53m in height. In the cave, there are stalactites and wall flowstones, while their surface is black and is seriously weathered.
and sometimes it is torrential. The outlet is on the bank of Liuchonghe River with the length of 2150m. The water yield at outlet is apparently more than that at the inlet, obviously, there are other supply resources.