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乌江上游的三岔河、六冲河两大水系,位于贵州高原西北部,流域面积一万八千多平方公里。包括毕节地区的赫章、毕节、大方、纳雍、织金、黔西,六盘水市的水城、六枝,安顺地区的普定、平坝、云南省的镇雄等县的全部或部分面积(见图1)。由于云贵高原新构造运动抬升强烈,致使岩性复杂,切割强烈,谷地狭窄,山高坡陡,最高海拔2500米以上,相对高差一般在300～400米之间,最大可达700米以上。境内分布着
Three Chahe upstream of the Wujiang River, Liuchonghe two major water systems, located in the northwestern Guizhou Plateau, drainage area of more than 18,000 square kilometers. Including all or part of the districts of Hezhang, Bijie, generous, Nayong, Zhijin, Qianxi and Liushui in Bijie, Pratunam in Banzhi, Pingba in Pingshun and Zhenxiong in Yunnan Province see picture 1). Due to the strong uplift of neotectonic movement in the Yungui Plateau, lithology is complex, cutting strongly, the valleys are narrow, and the mountain slopes are steep. The highest elevation is 2500 meters above sea level, and the relative elevation difference is generally between 300 and 400 meters with a maximum of 700 meters or more. Domestic distribution