Elevation ranges from 450 metres to over 6,826 (Reo Purgyil) metres above sea level. The region extends from the Shivalik range of mountains (barely mountainous region). 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. (Unfortunately most of the books and old records of himachal educational institutes, Employment Boards and different Govt websites show Shiela or Shilla as highest mountain (At 7,125 m or 7,025 m) in Himachal (forcing job aspirants to mark this as the correct answer in competitive exams, giving wrong information), which is not true and this mountain is not even in top 10 highest of Himachal. Mt Shilla is only 6,132 metres (20,118 ft) above sea level.)