No.9

30 km long, nearly east-west oriented, with a dendritic trough valley. The upper reaches are generally wider than 1.5 km, with depths exceeding 500 m; the lower reaches are typically wider than 2 km, with depths around 500 m. The relative height difference between the valley entrance and the end is 745 m, and the height difference between the peaks and the river valleys is around 2000 m. The valley contains many major scenic spots, with the most fascinating being the sea buckthorn forest near the Green Grass Field.