Reo Purgyil, also known as Leo Pargialand Leo Pargil,] is a mountain peak at the southern end of the Zanskar Range in the Western Himalaya area of the Himalayas. It is located on the Himachal Pradesh/Tibetan border in the Kinnaur district of Himachal Pradesh, India. At 6,816 m Reo Purgyil is the most elevated mountain crest in the territory of Himachal Pradesh. Geologically the peak is a dome structure and is part of a great massif that rises above the Satluj River (Sutlej) and overlooks the western valley of Tibet. The Spiti River, a right hand tributary of the Satluj, drains the northern face of the massif.
The highest peak is often obscured by clouds and is located about 2 km to the south of Peak 6791, a well known slightly shorter twin brother with a height of 6,791 m. Peak 6791 is widely referred to as Leo Pargial and has sufficient topographic prominence to be classified as a mountain in its own right. Nako village is the last road head for this expedition, located on the slopes of the mountain, close to the India-Tibet border.