大沙河，下游也稱小洪河，位於河南省東部和安徽省西北部，是渦河左岸一條支流，發源於河南省民權縣北黃河故道南側斷堤頭下，匯堤南區間水向東南，流經民權縣東南部，寧陵縣中部，商丘市睢陽區（原商丘縣）西南部，過鹿邑縣東北端宋河鎮（舊稱棗集鎮）後進入安徽省亳州市譙城區，於亳州市西郊注入渦河。全長90公里，流域面積1373平方公里。[1]
參考資料
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