龍河是長江的一級支流,位於中國重慶市東南部。上游分南北兩支,均發源於石柱縣,北支發源於方斗山,南支發源於七曜山,兩支在石柱縣橋頭鎮匯合後,呈東北-西南流向,經三河鄉、南賓鎮(石柱縣城)、下路鎮進入豐都縣江池鎮,入石板水庫,經龍河鎮、三建鄉,在雪玉洞附近折向西北,在豐都縣城三合鎮匯入長江。其中石柱縣境內又稱南賓河。流域形狀大致呈長方形,長約80千米,寬約30千米。流域中上游山勢陡峭,河谷深切,河道平均比降4.8%。[1]
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