It belongs to Huaihe River alluvial plain, with flat terrain and elevation of + 19.50 ~ + 23.50m. The Huaihe River is located in the south of Huaihe River, with a general water level elevation of + 17 ~ + 18m and a historical maximum flood level of + 25.63m (observed at Tianjiaan hydrological station on July 29, 1954).<br>
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