About 20 kms. South of Rangdum stands the Pazila watershed across which lies Zanskar, the most isolated of all the trans Himalayan Valleys. The Panzila Top (4401 m) is the picturesque tableland adorned with two small alpine lakes and surrounded by snow covered peaks. As the Zanskar road winds down the steep slopes of the watershed to the head of the Stod Valley, one of Zanskar's main tributary valleys, the majestic "Drang-Drung" glacier looms into full view. A long and winding river of ice and snow, the Drang-Drung" is perhaps the largest glacier in Ladakh, outside the Siachen formation. It is from the cliff-like snout of this extensive glacier that the Stod or Doda River, the main tributary of river Zanskar, rises.

Zanskar comprises a tri-armed valley system lying between the Great Himalayan Range and the Zanskar mountain; The three arms radiate star-like towards the west, north and south from a wide central expanse where the region's two principal drainage's meet to form the main Zanskar River. It is mainly along the course of this valley system that the region's 10,000 strong, mainly Buddhists population lives. Spread over an estimated geographical area of 5000 sq. kms. High rise, mountains and deep gorges surround Zanskar. The area remains inaccessible for nearly 8 months a year due to heavy snowfall resulting in closure of all the access passes, including the Penzi-la. To-day, Zanskar has the distinction of being the least interfered with microcosms of Ladakh, and one of the last few surviving cultural satellites of Tibet. Within the mountain ramparts of this lost Shangrila stand a number of ancient yet active monastic establishments. Some of these religious foundations have evolved around remote meditation caves believed to have been used by a succession of famous Buddhist saints for prolonged meditation in pursuit of knowledge and enlightenment.

The 240 km long Kargil-Padun road, of which the first 90 km stretch is paved, remains opened from around mid July to early November. In June, the summer is at its height in the region and the climate is ideal for trekking along the route free from vehicular traffic of any kind and when the countryside is freshly rejuvenated into life after months of frigid dormancy