Elevation ranges from 450 metres to over 6,826 metres above sea level. The region extends from the Shivalikrange of mountains. There is a noticeable increase in elevation from west to east and from south to north. At 6816 m Reo Purgyil is the highest mountain peak in the state of Himachal Pradesh. in Himachal, which is not true and this mountain is not even in top 10 highest of Himachal. Mt Shilla is only 6,132 metres The general physiographic divisions from south to north are:
The Shiwalik range consists of lower hills. The hills of the region are composed of highly unconsolidated deposits which results in high rates of erosion and deforestation. The lesser Himalayas are spotted by a gradual elevation towards the Dhauladhar and the Pir Panjal ranges. The rise is more rapid in the Shimla hills, to the south of which is the high peak of Choodh — Chandni. North of the riverSutlej, the rise is steady. The Kangra valley is a longitudinal trough which is at the foot of the Dhauladhar range. Dhauladhar has a mean elevation of nearly 4,550 metres. It has a rapid rise of 3,600 m above the Kangra valley. The largest of the lesser Himalayan ranges, the Pir Panjal, branches off from the Greater Himalayan range near the bank of the Sutlej. A number of glaciers exist and several passes lie across the Pir Panjal. The Rohtang Pass is one of these. The Great Himalayan range runs along the eastern boundary and is slashed across by the Sutlej. Some of the famous passes in this range are Kangla, Bara Lacha, Parang and Pin Parvati. The Zanskar Range, the easternmost range, separates Kinnaur and Spiti from Tibet. It has peaks up to 7,026 m high. Some of the well-known peaks are Shilla and Riwo Phargyul ; these are among the highest peaks in this range. There are many glaciers over the Zaskar and the Great Himalayan ranges. Himachal is well known for its rich flora. Forests cover about 38% of the state's area. It has a variety of wildlife, too. Himachal has 49 cities and towns. The smallest town is Naina Devi and the largest is Shimla with a total state population of 6,856,509. Urban population is only 7.5% of the state population. Most of the population resides in rural areas.