《水经注·卷十四》
索头水源出索头川，往南流经广阳侨郡西面，这个侨郡是魏时从右北平郡分出，郡治也就是今天安州的州治。
濡水又东南，索头水注之，水北出索头川，南流径广阳侨郡西，魏分右北平，置今安州治。
Suotou water originates in Suotou River, flows south and through the west of Guangyang Qia 郡 (jùn), this Qia 郡 was divided from Youbeiping郡 in the Wei period, and the administration of the Qia 郡 is the administration of the prefecture of Anzhou today.