河口(英语:river mouth)是河流下游尽头与其它水体(如海洋湖泊水库、另一条河流)的结合处。[1]海边的河口又称为河口湾

当河流和与之连接的另一水体的泥沙含量差异较大时,在河口处会出现“泾渭分明”的现象。在河口,水流条件的变化可能会导致河流携带的沉积物累积,形成多种地貌,例如三角洲沙洲沙嘴

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