Pilj Waterfall or simply Pilj, is the third highest waterfall in Serbia, being discovered by geologists and alpinists only in 2002. The waterfall is located in the south-eastern region of Visok, near the border of Bulgaria, on the southern slopes of the mountain of Stara Planina. The waterfall is located in the sparsely populated area, completely cut off from the rest of the world, without any access roads. As a result of this, the waterfall was discovered only recently.