Dazong Lake, the lake name, belongs to the Lixia River system. Located in Yandu District, Yancheng City, Jiangsu Province, and Xinghua City, Taizhou City, the local name is Pinghu, which is one of the remnant lakes after the differentiation and dissolution of ancient Sheyang Lake. Dazong Lake is located in the hinterland of Lixiahe Plain, which is the lowest terrain in Yundong Lake Group. The lake is slightly near the elliptical shape, with an area of 21 square kilometers, of which 16 square kilometers are water areas, which belong to the carbonate sodium group Ⅰ type freshwater lake.