Once brilliant. On undeveloped land, the estuary was not poor, and it was also called "Little Hong Kong", which was the hub of economic, trade and cultural activities at that time. After the reform and opening up, waterways became less important. Roads and railways have become the arteries to promote economic development, without passing through the estuary. In addition, in recent years, the estuary has been affected by floods many times, and it is also the poorest.