What do Shanghainese mean by upper corner and lower corner?

Shanghai is bounded by Suzhou River, with the south bank called Shangjiao and the north bank called Xiajiao.

During the old Shanghai period, most of the western and central parts of the French Concession and the Shanghai Public Concession belonged to the upper corner, while the China boundary and other urban-rural junctions belonged to the lower corner.

The distribution of the New Upper Corner generally continues the framework of the old Shanghai period and extends to Huangpu District, Jing 'an District, Xuhui District and Changning District, which are the core urban areas of Shanghai today. With the deepening of the transformation of the old city of Shanghai and the practical implementation of the North-South balance strategy, the scope of the upper corner of Shanghai will gradually expand to the whole central city of Shanghai.

Extended data:

Division of New Upper Corner and New Lower Corner in Shanghai

Shanghai * * * is 16 1 county Huangpu District, Xuhui District, Changning District, Jing 'an District, Putuo District, Zhabei District, Hongkou District, Yangpu District, Baoshan District, Minhang District, Jiading District, Pudong New Area, Songjiang District, Jinshan District, Qingpu District, Fengxian District and Chongming District. The distribution area of the new lower corner is basically concentrated in the vast suburbs of Shanghai.

The distribution areas of Xinshangjiao are Huangpu District, Jing 'an District, Xuhui District and Changning District. The distribution areas of New Summer Jiao are Zhabei District, Jiading District, Fengxian District, Qingpu District and Jinshan District.

Baidu encyclopedia-Shangzhijiao

People's Network-The Temper of "Xiajiao"

Shanghai Municipal People's Government Network-Wujiaochang: Shanghai's Future "Upper Corner"