《水经注·卷二》
都城四面环水，座落在河水的沙洲上。都城就是员渠城，西距乌垒四百里。
城居四水之中，在河水之洲，治员渠城，西去乌垒四百里。
The city was surrounded by water on all sides and was located on the sandbar of the river. The city was Yuanqu City, 400 li west of Wulei.