It is located on the border between Himachal Pradesh, India and Tibet, China.

[5] At 6,816 m, Reo Purgyil is the highest mountain peak in the state of Himachal Pradesh and is located in Kinnaur district.

Geologically the peak is a dome structure and is part of a great massif that rises above the Sutlej river and overlooks the western valleys of Tibet.

[2] The Spiti River, a right bank tributary of the Satluj, drains the northern face of the massif.

[8][9] Nako village is located on the slopes of the mountain, close to the India-Tibet border.