Jiangnan is south of the Yellow River in China.

"Jiangnan" has always been a constantly changing and flexible regional concept. In a narrow sense, Jiangnan refers to Nanjing, Suzhou, Zhenjiang, Changzhou and Wuxi in southern Jiangsu, Huzhou, Hangzhou, Shaoxing and Jiaxing in Zhejiang, and the Yangtze River Delta formed by Shanghai.

Geographically, Jiangnan also includes Wuhu, Maanshan and Huizhou in Anhui, Nanchang, Jiujiang, Shangrao and Jingdezhen in the north and northeast of Jiangxi, Yueyang, Changsha, Yiyang and Changde in Hunan, and Jiangnan in Hubei.

During the Ming and Qing Dynasties, Jiangnan was mainly the former Jiangxi Province, jiangnan province (Jiangsu, Anhui) and northern Zhejiang.

The meaning of "Jiangnan" in ancient literature is varied.

It is often an ambiguous word juxtaposed with regional concepts such as "Jiangbei" and "Central Plains".

Historically, Jiangnan is not only a natural geographical area, but also a social and political area.

Jiangnan in a broad sense includes the whole territory of Shanghai, Jiangxi, Hunan and Zhejiang, as well as the areas south of the Yangtze River in Jiangsu, Anhui, Hubei and Shanghai.

Compared with Jiangnan Road in Tang Dynasty, there are fewer parts involving Guizhou Province.

Northern Fujian is sometimes called Jiangnan.

In a broad sense, Jiangnan has a vast territory and diverse landforms, so it is often regarded as "Great Jiangnan", which is roughly consistent with the meteorological scope of Jiangnan.

Four rice markets and four famous buildings in Jiangnan are all within the scope of Jiangnan.

This area includes three famous mountains, three rivers and three lakes-Qiantang River and Taihu Lake in Huangshan, Ganjiang River and Poyang Lake in Lushan, Xiangjiang River and Dongting Lake in Hengshan. These three rivers and lakes are the cradles of Wu culture, Jiangxi culture and Huxiang culture respectively.

The definition of "Great Jiangnan" begins with the ancient division (Jiangnan Road) and is often described in literary works.

For example, Du Fu's Random Encounter Li Guinian was written in Changsha.

The Jiangnan referred to in the weather forecast is roughly the Jiangnan zone in a broad sense.

The word "Jiangnan" has also been used for administrative divisions in official geographical records since the Yuan Dynasty. Jiangnan provinces in the early Qing Dynasty, that is, Jiangsu, Anhui and Shanghai are now collectively called Jiangnan. Suzhou, Songjiang, Changzhou, Zhenjiang, Jiangning, Hangzhou, Jiaxing and Huzhou are also the most representative administrative places in the Qing Dynasty.

The top eight states are: qingyuan prefecture (Mingzhou), Shaoxing (Yuezhou), Jiande (Yanzhou), Quzhou, Wuzhou, Ruian (Wenzhou), Taizhou and Chuzhou.

The next eight counties are: Pingjiang Prefecture (Suzhou), Lin 'an Prefecture (Hangzhou), Jiaxing Prefecture (Xiuzhou), Zhenjiang Prefecture (Runzhou), Nanxing Army (Yixing), Changzhou, Anji Prefecture (Huzhou) and Jiangyin Army (Jiangyin).