Which Jiangsu ports became important for foreign trade and exports?

Jiangsu province has become a major exporter for China, with several provincial ports handling goods that were previously shipped through Shanghai. The primary ports that have become important for foreign trade and exports include:1

• Nantong: Featuring an extensive deepwater frontage on the Yangtze River, this port was designated as an "open" city to foster foreign trade and investment. It has developed its own economic and technical investment zone.1
• Lianyungang: As the eastern terminus of the Longhai Railway, this port serves as a key export outlet for central and northwestern provinces. It was also among the first coastal cities opened to foreign investment in the 1980s.12
• Zhangjiagang: This port is identified as one of the provincial facilities that now handles significant export volumes for the region.1

While other cities like Zhenjiang serve as busy ports, their trade has historically been primarily domestic, focusing on the transshipment of goods such as grain, cotton, and oils.3