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Jing-Hang Grand Canal: Ancient China's longest waterway.
By far the longest canal was the Grand Canal of China, still the longest canal in the world today. It is 1,794 kilometres (1,115 mi) long and was built to carry the Emperor Yang Guang between Beijing and Hangzhou. The project began in 605 and was completed in 609, although much of the work combined older canals, the oldest section of the canal existing since at least 486 BC. Even in its narrowest urban sections it is rarely less than 30 metres (98 ft) wide.
Grand Canal of China - construction began in 486 BCE and was completed 605-610 CE
47 World Heritage Sites in China: The Temple of Heaven in Beijing
The Grand Canal of China is the longest canal or river in the world. It's length is at a astounding 1,104 miles long or 1,776 km, this canal had a few use's, but was mostly used for transportation throughout China.