嘉陵江上游较大支流,发源于西秦岭末端甘肃省天水市西南的齐寿山,流经甘肃省礼县、西和、成县、徽县、康县和陕西省略阳等地,于两河口注入嘉陵江。西汉水亦有“犀牛江”之名。《清史稿》:“西汉水,西北自(阶)州境入,经(成)县西南,……纳县境诸水,西南流注之。西汉水至此蒙犀牛江之称。”《读史方舆纪要》:“犀牛江,即西汉水也。自成县西南流,接(阶)州界,复折而东南,入汉中略阳县境。”西汉水在古籍中亦有“故道水”、“潜水”、“垫江”的称谓,盖因误以为西汉水是嘉陵江上游的主流,称嘉陵江为西汉水 The larger tributaries of the upper reaches of Jialing River originate from Qi Shoushan, which flows to the southwest of Tianshui City, the end of West Qinling. It passes through Lishou, Xijie, Chengxian, Huixian and Kangxian in Gansu Province and Lueyang in Shaanxi Province, inject Jialing River . The Western Han Dynasty also has “Rhinoceros” name. “History of the Qing Dynasty”: “Western Han Dynasty water from the northwest from (state) into the territory, the (Cheng) County, southwest, ... ... Naxian county water, southwest flow of the West Han River water so far, said the rhinoceros. ”Reading History Fangyu Minutes“: ”Rhinoceros River, that is, the Western Han Dynasty water too. Since the county southwest flow, then (order) state, Fold off and southeast, into the Han Lueyang County.“ ”Western Han Dynasty in ancient books There are also “old water”, “diving”, “Dianjiang” appellation, cover because of the mistaken belief that the Western Han Dynasty is the mainstream of the upper reaches of Jialing River, said Jialing River