《水经注·卷八》
又往北流经东平陵老城西面，这里就是旧时的陵城，后来才加上平字，称为平陵。
又北径东平陵县故城西。故陵城也，后乃加平，谭国也。
It then flows northward through the west of the old city of Dongpingling, which was the old Lingcheng, and later the word "ping" was added to become Pingling.