During the Spring and Autumn Period and the Warring States Period, Shanghai was the fiefdom of Huang Xie, Lord Chun Shen of Chu State, so Shanghai was also affectionately called 'Shen City'. In the fourth and fifth centuries of the Jin Dynasty, fishermen created a fishing tool called 'Hu', so the place where the river flows into the sea was called 'Du', so the area downstream of Songjiang River wa...