Mangku Sakti is one of the beautiful waterfalls are located at the slopes of Mount Rinjani. Precisely located in the sub-village of Sajang, Sajang village, Sembalun district, Lombok Timur regency, West Nusa Tenggara. Mangku Sakti water is derived from the flow Kokoq Puteq (White River) which is sourced directly from Segara Anak (the lake on Mount Rinjani). This waterfall has a sulfur content so that the water color is white and greenish. With the sulfur content is the locals believe that can be used to cure different kinds of skin diseases. This waterfall is reaches 30 meters height. The pond is deep enough and wide, which is amazing from this waterfall is very beautiful rock cliffs.