牛日河（彝語北部方言：ꑍꉘꏛꒊꃀ，羅馬化：Nyip Hxo Ryx Yyp Mop[1]），是中國長江流域的一條河流，匯入大渡河中游，屬於大渡河水系。河長123千米，流域面積4090平方千米，年均流量125立方米每秒。自然落差1960米。水能理論蘊藏量48萬千瓦。[2]
參考文獻
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