定南水，又名九曲水、貝嶺水，是中國南方的一條河流，為東江的源流之一。發源於江西省尋烏縣三標鄉大湖崬村基隆嶂東側，流經江西省的安遠縣、定南縣和廣東省和平縣與龍川縣，在龍川縣匯入東江的楓樹壩水庫。幹流長140千米，河道平均比降1.98‰，天然落差861米，流域面積2364平方千米。年均徑流量20.18億立方米。[1]
參考資料
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