Gyachung Kang is a mountain in the Mahalangur Himal section of the Himalayas and is the highest peak between Cho Oyu and Mount Everest. It lies on the border between Nepal and China. As the 15th highest peak in the world, it is also the co highest peak that is not an eight-thousander; hence, it is far less well-known than the lowest of the eight-thousanders, which are only about 100 m higher. The peak's lack of significant prominence also contributes to its relative obscurity.