Introduction to Tumen River: The water resources of Tianfozhishan National Nature Reserve belong to the Tumen River water system, which flows from Helong City and runs through the reserve for 110 kilometers. The water system in the area is distributed in a tree shape, forming a relatively dense water network. The main tributaries include Shanxi Valley, Dadong Valley, Xiama Lai Valley, Xilai Valley and Anmintaigou, all of which flow into the Tumen River.