Fresh water has a lower density than saltwater which means it will “float” on top. This does not mean, however, that there is a clean line of delineation. Rather, the meeting of the two creates what is called brackish water. This effect creates very important habitats including estuaries, mangroves, and marshes.
In some rare cases there is a clean line of delineation, where the salty water on the bottom appears to shimmer like a mirror, as the diver floats above it. A great place to see this is Cenote Tajmahal; the interface between the upper layer is termed a halocline.
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