《水经注·卷三十二》
老城利用山冈的险阻之势而筑，北濒沮水，老城在东面一百四十里，所以叫东城，在绿林长坂以南―长坂，就是张翼德横矛却敌的地方。
城因冈为阻，北枕沮川，其故城在东百四十里，谓之东城，在绿林长坂南，长坂即张翼德横矛处也。
The old city was built by utilizing the danger of the hills, facing the Ju River to the north, the old city was 140 miles to the east, so it was called Dongcheng, south of Lvlin Changban-Changban, which was where Zhang Yide blocked the enemy with a spear.