Introduction to Longwan Ancient Waterwheel: The water of the Yellow River flows endlessly from west to east, and the waterwheel is just like the mother pearl of the Yellow River. It has been along the banks of the Yellow River for thousands of years and has been passed down to this day with its unique grace. Since the invention of the waterwheel by Duan Xu during the Jiajing period of the Ming Dynasty, things have changed for hundreds of years. The Longwan ancient waterwheel has added rich tourism connotations to its original main function of diversion and irrigation.