Cho Aui. Cho Aui lies on the Tibetan-Nepalese frontier west of Cho Oyu. The leader of this ten-man Himalayan Association of Japan expedition was Hiroshi Yajima. After approaching via Xigar, they got to Base Camp near the Gyabrag Glacier at 5800 meters on September 21. Camp I was established on the glacier at 6100 meters on September 25. From there they carried out reconnaissance and prepared the route. Beyond the icefall there was a difficult ice face, which took them onto the northwest ridge. They fixed rope to the ridge crest and placed Camp II on the ridge at 6700 meters on the 29th. After a rest at Base Camp, they were back in Camp II. Yukitoshi Endo, Yoshihiro Shikoda, Katsushi Emura and Katso Matsuki left for the summit on October 11, but they had to bivouac at 7200 meters. On October 12 at noon they got to the summit (7350 meters, 24,115 feet). Leader Yajima, Mitsuyoshi Onodera, Osamu Sato, Keiji Ishikawa, Toshio Yamada and Omohaka Okobu reached the top at two P.M. on October 14.