《水经注·卷十四》
濡水又往东南流，与洛水汇合。洛水发源于卢龙塞，往西南流，注入濡水。
濡水又东南，洛水合焉，水出卢龙塞西，南流注濡水。
River Ru flows southeast again and converges with River Luo. River Luo originates from the Lulu Pass, flows southwest, and pours into River Ru.