《后汉书·列传·南匈奴列传》
左部向北经过西海到达河云北面，右部从匈奴河的西面绕过天山，向南渡过甘微河，两军相会，夜间包围了北单于。
左部北过西海至河云北，右部从匈奴河水西绕天山，南度甘微河，二军俱会，夜围北单于。
The left wing marched north through the western sea and reached the northern bank of the He Yun River. The right wing marched west of the Xiongnu River, went around the Tianshan Mountain, crossed the Ganwei River to the south, and joined the other wing. They surrounded the Northern Chanyu at night.