Nam Rut waterfall or Rainfall waterfall is a waterfall on the Thuong Nung river in the land of Nam Rut village, Than Xa commune, Vo Nhai district, Thai Nguyen province, Vietnam. The waterfall is named after the village, which in Tay language means Rainfall. The waterfall falls from the limestone mountain into the Thuong Nung river, creating a white water patch like falling rain, is a rare landscape and is called Rainfall waterfall by tourists.