榜沙河,位於中華人民共和國甘肅省東南部的一條河流,為渭河右岸支流。源頭稱閭井河,發源於定西市岷縣東南部閭井鎮新莊村魚池溝以南的岷峨山北麓,[1][2]一說發源於閭井鎮林口村東南西秦嶺直拉梁北側,[3]蜿蜒向西北流至蒲麻鎮磚塔寨村轉東北流後又稱黑虎河,經漳縣東南部和武山縣西北部,於武山縣鴛鴦鎮以東匯入渭河。河長169千米,流域面積1554平方千米。年均徑流量5.45億立方米,年均輸沙量95.3萬噸。榜沙河是渭河支流中水量最大、泥沙最少、水質最好的一條。[1]
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