Nangpai Gosum I (7351m, also called Cho Aui or Pasang Lhamu Chuli, lies on the ridge to the east of Cho Oyu. Nangpai Gisum I was first climbed by a Japanese expedition starting from Tibet via the northwest ridge with Katsushi Emura, Yukitoshi Endo, Katsuo Matsuki and Yoshihiro Shikoda reaching the summit on October 12, 1986, followed by six more expedition members two days later.