This silted base, the edge of the North China Plain, was built up over time by ... area as a center of commerce which gave rise to the ancient city of Ji.

North China Plain: Bordering on the Taihang Mountains in the west, the coast in the east, Yanshan Mountain in the north and Huaihe River in the south, it covers 310,000 square km, with an ...

But it’s always changing. This is especially true on the North China Plain. From imperial times to the Maoist period to the recent reform phase, humans have tried to control the environment.