Cho Oyu, a neighbor of Everest, is perhaps the safest 8000M peak as the difficulties of the climb are low, but is still an incredible challenge. A new film that shows a recent climb. Cho Oyu is the sixth highest mountain in the world. Located in the Himalayan Range, 25 miles west of Mount Everest, Cho Oyu’s massive bulk straddles the border between Nepal and Tibet.