河口(英語:river mouth)是河流下游盡頭與其它水體(如海洋湖泊水庫、另一條河流)的結合處。[1]海邊的河口又稱為河口灣

當河流和與之連接的另一水體的泥沙含量差異較大時,在河口處會出現「涇渭分明」的現象。在河口,水流條件的變化可能會導致河流攜帶的沉積物累積,形成多種地貌,例如三角洲沙洲沙嘴

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