《资治通鉴·魏纪·魏纪四》
大家都认为： 丹阳地势险阻，与吴郡、会稽、新都、番阳四郡邻接，周围数千里，山谷万重。
众议咸以为： 丹杨地势险阻，与吴郡、会稽、新都、番阳四郡邻接，周旋数十里，山谷万重。
Everyone thought that Danyang was a dangerous and difficult area, bordering the four commanderies of Wu Commandery, Kuaiji Commandery, Xindu Commandery, and Fanyang Commandery, and extending for several thousand li around, with countless valleys and ravines. 