It is equivalent to southern Jiangsu, central Zhejiang and southern Anhui.

In ancient times, it was called Wu Dong, Zhong Wu and Xi Wu, and Wu Dong meant Suzhou. Mao Zedong has a poem, "Yellow cranes float in the cloud nine schools, and white smoke rises under the waves".

Wu Dong was the State of Wu in the Three Kingdoms period, also known as Sun Wu.

In the 3rd century A.D., Sun Quan established political power, and the capital began to be built in Wu (now Suzhou). Later, Sun Quan built a stone city (now Nanjing).

In 222, Sun Quanzhao Wu Wang. In April of the first year of Huanglong (229), Dongsheng Sun, the country name Wu, changed to Huanglong, belonging to the genus.

He died in the Western Jin Dynasty in 280, and the Three Kingdoms ended.

Sun Wu is the longest-lasting country among the three kingdoms, which lasted for fifty-two years (fifty-nine years from 222 AD) under the rule of four emperors, namely Sun Quan, Sun Liang, Sun Xiu and Sun Hao.

Sun Wu has made great contributions to the development of Jiangnan, promoted the development of local economy and culture, and also carried out maritime exchanges. Daqin merchants and Lin Yi envoys have arrived in Wudu for business. The demise of Sun Wu also marked the complete end of the separatist regime since the end of the Han Dynasty and the Three Kingdoms.

References:

Baidu Encyclopedia-Wu Dong