Why are dikes important along Zhejiang's northern coastal lowlands?

Dikes are essential along the northern coastal lowlands of Zhejiang primarily to provide critical protection against flooding and the sea.12

The northern section of the province is situated within the fertile Yangtze River delta, a region characterized by a complex network of rivers and canals. Because these low-lying areas are susceptible to inundation from both riverine floodwaters and tidal influences, dikes serve as vital infrastructure to safeguard the land. Specifically, these structures protect the region's highly productive rice lands and other agricultural areas from being submerged.132

Furthermore, the coastal regions of Zhejiang are frequently impacted by typhoons, which bring the threat of storm surges and destructive weather, reinforcing the necessity of these protective barriers for the safety and stability of the coastal environment.4