《资治通鉴·隋纪·隋纪五》
炀帝命令开凿江南河，自京口至余杭，长八百余里，宽十余丈，使之可以通行龙舟，并在沿岸设置驿宫、临时停顿处，打算向东巡游会稽。
敕穿江南河，自京口至馀杭，八百馀里，广十馀丈，使可通龙舟，并置驿宫、草顿，欲东巡会稽。
Emperor Yang ordered the construction of the Jiangnan Canal, which was more than 800 _li_ long and more than 10 _zhang_ wide, from Jingkou to Yuhang, so that dragon boats could pass through it. He also set up post houses and temporary resting places along the coast, intending to巡游 to Kuaiji in the east.