Dai Yem Waterfall known as the "Waterfall She", "Ban Vat waterfall" located in Muong Sang Commune, Moc Chau district, Son La province. The reason is called Dai Yem because according to legend, by a series of cynical exploitation of boys rescue the girl escape the flood waters. Waterfall located on the Vat stream originates from two canyons Bo Co Lam and Bo Ta Chau, the village of Thai people have a long history. Stream flow is 5 km confluence with Bo Sap stream, a large stream derived from the Bo Sap village in Vietnam - Laos border and then flows on land Yen Chau. At the confluence of two streams, the water having a limestone area and poured down the strip forming Dai Yem Waterfall. Dai Yem Waterfall range consists of two parts, the upper waterfall measuring 70 meters, below the waterfall which is located 150-200 meters. In the dry season, the bottom falls only flow from a height of 50 meters to rocks below. Two cascades down to a total height of 100m, one side is divided into 9 floors, the remaining 5 floors. Between the two operators is a convenient flat ground for the visit of tourists. The vegetation on top of the falls is quite rich.
