Introduction to the Qingjiang Gate: The Qingjiang Gate is a major symbol of the Li Canal. It was built by Chen Xuan in the Yongle period of the Ming Dynasty and is still standing intact today. The gate is as wide as 2 feet and 2 feet. It was once a choke point for grain transportation. During the grain transportation season, thousands of canal boats and canal troops stretched for several miles, which was a spectacular sight. Today, the preserved Qingjiang Gate has become an extremely rare engineering building in the history of my country's canals, reflecting the wisdom and talent of the working people in ancient my country. The rebuilt stone monument "Southern Ship and North Horse Boat Landing" not far from the gate is also a symbol of this important hub.