An estuary that occurs within the mouth of a river where freshwater flows out to sea at the surface while seawater flows upstream along the bottom is

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A salt wedge estuary occurs within the mouth of a river where freshwater flows out to sea at the surface while seawater flows upstream along the bottom, creating a layer of saline water that wedges between the freshwater and seawater layers. This results in a stratification of water, with freshwater at the surface and saltwater at the bottom.

An Estuary That Occurs Within the Mouth of a River