Grand Canal (China)
Emperor Yang extends the Sui canal network to Hangzhou
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Original prompt & settings (JSON) ↗The famous “completion in 609” dissolves into three separate construction dates: 605, 608 and 610.
Three orders, not one completion
The major Sui canal works were a multiyear sequence rather than a single completion in 609. Emperor Yang ordered the Tongji Canal in 605, work on the northern Yongji Canal began in 608, and he ordered the southern extension toward Hangzhou in 610.
No consulted scholarly chronology identifies 609 as the year the whole system from the north to Hangzhou was finished.
Some summaries use 605–609 for Emperor Yang’s principal works, while detailed chronologies place the southern extension in 610 — and one recent Cambridge excerpt describes the broader project as completed in 611.
What each stage joined
The 605 Tongji project linked Luoyang to the Huai River and joined an older route running south to the Yangtze at Yangzhou, establishing the Yellow–Huai–Yangtze connection before 609.
The Yongji Canal begun in 608 ran north-east from near the confluence of the Yellow and Luo rivers to the vicinity of modern Beijing.
The 610 order carried the network from the Yangtze opposite Yangzhou to the head of Hangzhou Bay — about 270 miles, in the Cambridge history’s figure.
Dug by levy, and partly already there
Corvée levies did the work. For the 608 project, women were compelled to labour alongside men.
The Sui shu reports one million or more workers for the longer 605 northern stretch and 100,000 or more for the Huai-to-Yangtze stretch, though the historian cautions those figures may count twenty-day corvée periods rather than people working simultaneously.
The resulting system used artificial canals, canalised rivers and older waterways rather than one wholly new trench.
Sources
Researched 23 Aug 2026 6 sources not yet audited Date disputed
How this was checked
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Date disputed. Sources disagree; the research places it at ~0610.
What the sources leave uncertain
- No consulted scholarly chronology identifies 609 as the year in which the entire Beijing-to-Hangzhou system was completed.
- Some summaries use 605–609 for Emperor Yang's principal works, while detailed chronologies place the Jiangnan extension in 610; one recent Cambridge excerpt even describes the broader project as completed in 611.
- 'Grand Canal' can denote the Sui-Tang network, the later Beijing-Hangzhou main stem or the larger UNESCO heritage system. Their routes and lengths are not interchangeable.
- The Sui sources' enormous labor totals may count cumulative corvée service periods rather than people working simultaneously.