《汉书·传·王莽传下》
九虎将军到达华阴县回溪，扼守险要，北起黄河，南到崤山。
九虎至华阴回溪，距隘，北从河南至山。
The Nine Tigers general arrived at the dangerous area of Huaxi, Huayin County, starting from the Yellow River in the north and reaching the Xiaoshan mountain in the south.