孙吴扬州曾一度置废古鄣郡 ①,前人在对三国疆域沿革的研究中于此均失考。钱大昕《廿二史考异》卷一七考有废云阳郡 ②,吴增仅《三国郡县表》卷七考有废临川郡 ③、废东安郡 ④、废彭泽郡 ⑤。钱大昕及吴增仅所考孙吴扬州四个废郡均见载于《三国志·吴志》 ,废古鄣郡未见载于《 Sun Wu Yangzhou once abandoned the ancient Kuijie County ①, the predecessors in the study of the history of the Three Kingdoms are hereby lost test. Qian Daxin “twenty-two history test different” volume test of a waste of Yunyang County ② test, Wu Zeng only “Three Kingdoms County Table” Volume seven test waste Linchuan County ③, waste Dongan County ④, waste Pengze County ⑤. Qian Daxin and Wu Zeng only test Sun Wuzhou four waste counties are found in the “Three Kingdoms Wu Zhi”