Pretapuri; Seventy-five kilometers west of Darchen, Pretapuri is one of the most sacred of the eight Underground Abodes (sa 'og gi gnas brgyad, see note 10). Vajra Varahi is the chief deity of the place. According to the Padma Katang (padma bka' thang, chap. 6), the subjugation of Rudra took place at Pretapuri. This site has also been blessed by Guru Padmasambhava and many other saints. Khyung Lung Monastery is located about thirty kilometers west of Pretapuri. It initially followed the Bönpo tradition and later turned to the Gelukpa school.