Dividing line between fresh and salt water

Dividing Line between fresh and salt water – does this have a name ?

Here is one from today as a river flows into the sea, the line is quite obvious as the river was in spate and coloured, but even when not coloured it is sometimes possible to make out this line. I’m sure it must have a scientific name but can’t find it.

👉 In Proverbs 8:29 ISV
” When he set a boundary for the sea so the waters would not exceed his limits, …”

— Boundry :
a line that marks the limits of an area; a dividing line.

Fresh and Salt Water – Between them is a Barrier which they do not transgress. Amazing Phenomenon.

This barrier divides the two seas so that each sea has its own temperature, salinity, and density.It has been discovered that what distinguishes fresh water from salt water in estuaries is a “pycnocline zone with a marked density discontinuity separating the two layers.

In James 3:11-12 ” Can both fresh water and salt water flow from the same spring? My brothers and sisters, can a fig tree bear olives, or a grapevine bear figs? Neither can a salt spring produce fresh water.

What is Pycnocline Zone ?

Pycnocline Zone in the oceans where water density increases rapidly with depth in response to changes in temperature and salinity. The pycnocline tends to coincide with the thermocline and halocline, and separates the surface-water zone of ocean waters from the deep bottom water.