Cho Oyu (or Qowowuyag; in Nepal चोयु, Tibetan in Wylie transliteration: jo bo dbu yag; Chinese: 卓奧有山, Pinyin: Zhuó'àoyǒu Shān) is the sixth highest mountain in the world. Cho Oyu lies in the Himalayas and is 20 km west of Mount Everest, at the border between China and Nepal. Cho Oyu means "Turquoise Goddess" in Tibetan.
Cho Oyu was first attempted in 1952 by an expedition organised and financed by the Joint Himalayan Committee as preparation for an attempt on Mount Everest the following year. The expedition was led by Eric Shipton and included Tom Bourdillon, but technical difficulties at an ice cliff above 6,650m (21,820ft) proved beyond their abilities. (Today, these ice cliffs are normally ascended using fixed ropes.)
Just a few kilometres west of Cho Oyu is Nangpa La (5,716m/18,753ft), a glaciated pass that serves as the main trading route between the Tibetans and the Khumbu's Sherpas. Due to its proximity to this pass and the generally moderate slopes of the standard northwest ridge route, some climbers consider Cho Oyu to be the easiest 8,000 metre peak to climb[2], and it is a popular objective for professionally guided parties.
1954 First ascent by Austrians Joseph Jöchler and Herbert Tichy, and Pasang Dawa Lama (Nepal)[1]
1958 Second ascent of the peak, by an Indian expedition. Sherpa Pasang Dawa Lama reached the peak for the second time. First death on Cho Oyu.[1]
1959 Four members killed in an avalanche during a failed international women's expedition.[1]
1964 Controversial third ascent by a German expedition as there is no proof of reaching the summit. Two mountaineers die of exhaustion in camp 4 at 7,600m (24,935ft).[1]
1978 Edi Koblmüller and Alois Furtner of Austria summit via the extremely difficult southeast face.[1]