Tuyuhun (Chinese: 吐谷渾; LHC: *tʰɑʔ-jok-guən; Wade-Giles: T'u-yühun), also known as Henan (Chinese: 河南) and Azha (Tibetan: ཨ་ཞ་, Wylie: ‘A-zha; Chinese: 阿豺), was a dynastic monarchy established by the nomadic peoples related to the Xianbei in the Qilian Mountains and upper Yellow River valley, in modern Qinghai, China.
