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Introduction to wetland resources: The reserve is located in the transition zone from China's warm temperate zone to the subtropical zone. Its landform features include back river depressions, trough-shaped depressions and vast Yellow River tidal flats left over from the Yellow River's diversion. Its water source comes from surface runoff during the flood season. , diversion of water from the Yellow River and groundwater, it is a rare natural wetland in the densely populated areas of the Central Plains of China.