Subei

Subei is a region in Jiangsu province, China, located north of the Yangtze River. It is characterized by alluvial plains and is part of the larger North China Plain. Historically, Subei has faced drainage challenges, with rivers like the Huai and, at times, the Yellow River flowing through it, often causing floods.

The Subei Canal was constructed to manage these waters, providing an outlet to the sea for the Huai River and forming part of an extensive irrigation and hydroelectric power network. This region is densely populated and relies on agriculture, though it is considered relatively poorer compared to the Jiangnan region south of the Yangtze River.123