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The total river basin area of Heze City is 13,111 square kilometers. Except for the Yellow River beach and the old lake area of Dongping Lake, 632 square kilometers, the rest of the slope water is discharged from Nansi Lake and then transferred to Huaihe River. Therefore, the area basically belongs to the Huaihe River Basin. There are six main rivers in the territory, including Dongyu River, Zhuzhao Xinhe River, Wanfu River, Liangji Canal, Taihang Dihe River and the old course of the Yellow River. There are 45 tributaries with a basin area of over 111 square kilometers and 41 tributaries with a basin area of over 51-99 square kilometers, with a total length of 2,582 kilometers.