The Grand Canal, a vast inland waterway system, is the longest and oldest canal in the world. (construct) in sections from the 5th century BC and completed and maintained by several (dynasty), it formed the backbone of China's inland communications system, enabling the supply of rice (feed) the population. The Grand Canal reached a new peak in the 13th century, providing an inland (ship) network consisting of more than 2,000 km of artificial waterways, linked five of the most important river basins in China. Still major means of internal communication today, it (play) an important role in ensuring the prosperity and stability of China over the ages. The Grand Canal bears witness to a (remark) and early development of hydraulic engineering ( 水 利 工 程 ). It is a perfect example of dealing difficult natural conditions, as is reflected in the many constructions that are (full) adapted to the diversity and complexity of circumstances.
