Proper noun
the North China Plain
A large alluvial plain of northern China, bordered to the north by the Yanshan Mountains, to the west by the Taihang Mountains and Funiu Mountains, to the southwest by the Dabie Mountains and Tongbai Mountains, and to the east by the Yellow Sea and Bohai Sea, and merging with the Jianghuai Plains to the south.
Haze over the North China Plain and the Lüliang Mountains of Shanxi Natural colour satellite image of a smog event in the heart of northern China Dense smog settled over the North China Plain on February 20, 2011. Source: Internet
This is attributed to the greater ease of travel and communication in the North China Plain compared to the more mountainous south, combined with the relatively recent spread of Mandarin to frontier areas. Source: Internet