Introduction to Hengshui Lake: The Hengshui Lake area belongs to the Quaternary basement structure and is commonly known as "Qianqingwa" and "Qianqingwa Reservoir". Its area and water storage scale are second only to Baiyangdian. It is the second largest freshwater lake in the North China Plain, and its single water area ranks first in North China. While becoming a protected area, it is also an important hub for the national water conservancy scenic spot and the "South-to-North Water Diversion" project.