The Great Himalayas lie north of the Lower Himalayan Range. These mountains are bounded by the Indus River in the north and the west as the river takes a southward turn at Sazin. The average height of the range is about 6000 meters. Some of the highest peaks in the world lie in these mountains e.g. Nanga Parbat (8126 meters), which is the sixth highest peak in the world and the second highest peak in Pakistan. Since the mountains are perpetually covered with snow there are many glaciers, with Rupal Glacier being the longest (17.6 km) . The glacial action has created many beautiful lakes like the Saiful Muluk lake which lies in the upper Kaghan Valley. Another noticeable geographic feature of this area are the deep gorges carved by the Indus in this region. The deepest of which, located at Dasu-Patan region (Kohistan District), is 6500 meters deep.
