Introduction to Zhenhaitai: The north gate of the ancient city, commonly known as the Hanbei Gate, no longer exists. The road arcing to the east is the ring road built on the basis of the ancient city wall. In ancient times, one could go out of this north gate to the bank of the Yangtze River to board a boat and enter the sea. The ocean is vast and boundless, and people sailing into the sea hope that they can conquer the ocean and return safely. The ocean not only brings wealth to people, but also threatens people with typhoons, tides, and thieves. In order to pray for a peaceful and peaceful life, people bring this to Beicheng. The gate is called "Zhenhai Gate". This city platform is also named "Zhenhaitai".