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无定河是黄河中游托克托至龙门间最大的支流,也是一条著名的多沙河流。它发源于陕西省白于山北麓,干流长491公里,流域面积30261平方公里,主要流经内蒙古自治区伊克昭盟和陕西省榆林、延安两个地区,及17个县(旗)。它流向
Wudinghe is the largest tributary of the middle reaches of the Yellow River between Tuoketuo and Longmen and is also a famous Duosha River. It originated in the northern foot of Baisu Mountain in Shaanxi Province. The main stream is 491 kilometers long and the drainage area is 30,261 square kilometers. It flows mainly through Yikezhao League in Inner Mongolia Autonomous Region and Yulin and Yan’an in Shaanxi Province and 17 counties. It flows